Remove unneeded `normalizeKeyName` utility use

`normalizeKeyName` provided normalization of `event.key` names for
key* events for legacy browsers. We no longer support those legacy
browsers (IE11, Legacy Edge), so this utility is no longer necessary.

src/shared/shortcut.js

-import { normalizeKeyName } from '@hypothesis/frontend-shared';
-
 import { useEffect } from 'preact/hooks';
 
 /**
@@ -55,7 +53,7 @@ export function matchShortcut(event, shortcut) {
 
   return (
     actualModifiers === requiredModifiers &&
-    normalizeKeyName(event.key).toLowerCase() === requiredKey
+    event.key.toLowerCase() === requiredKey
   );
 }
 

src/sidebar/components/Annotation/AnnotationEditor.js

-import { normalizeKeyName } from '@hypothesis/frontend-shared';
 import { useCallback, useState } from 'preact/hooks';
 
 import { withServices } from '../../service-context';
@@ -165,7 +164,7 @@ function AnnotationEditor({
   // Allow saving of annotation by pressing CMD/CTRL-Enter
   /** @param {KeyboardEvent} event */
   const onKeyDown = event => {
-    const key = normalizeKeyName(event.key);
+    const key = event.key;
     if (isEmpty) {
       return;
     }

src/sidebar/components/MarkdownEditor.js

@@ -3,7 +3,6 @@ import {
   IconButton,
   LabeledButton,
   Link,
-  normalizeKeyName,
 } from '@hypothesis/frontend-shared';
 import classnames from 'classnames';
 import { useEffect, useMemo, useRef, useState } from 'preact/hooks';
@@ -394,7 +393,7 @@ export default function MarkdownEditor({
     }
 
     for (let [command, key] of Object.entries(SHORTCUT_KEYS)) {
-      if (key === normalizeKeyName(event.key)) {
+      if (key === event.key) {
         event.stopPropagation();
         event.preventDefault();
         handleCommand(/** @type {Command} */ (command));

src/sidebar/components/Menu.js

 import classnames from 'classnames';
-import {
-  Icon,
-  normalizeKeyName,
-  useElementShouldClose,
-} from '@hypothesis/frontend-shared';
+import { Icon, useElementShouldClose } from '@hypothesis/frontend-shared';
 import { useCallback, useEffect, useRef, useState } from 'preact/hooks';
 
 import MenuArrow from './MenuArrow';
@@ -137,7 +133,7 @@ export default function Menu({
   // It should also close if the user presses a key which activates menu items.
   /** @param {KeyboardEvent} event */
   const handleMenuKeyDown = event => {
-    const key = normalizeKeyName(event.key);
+    const key = event.key;
     if (key === 'Enter' || key === ' ') {
       // The browser will not open the link if the link element is removed
       // from within the keypress event that triggers it. Add a little

src/sidebar/components/MenuItem.js

 import classnames from 'classnames';
-import { Icon, normalizeKeyName } from '@hypothesis/frontend-shared';
+import { Icon } from '@hypothesis/frontend-shared';
 import { useEffect, useRef } from 'preact/hooks';
 
 import MenuKeyboardNavigation from './MenuKeyboardNavigation';
@@ -161,7 +161,7 @@ export default function MenuItem({
 
   /** @param {KeyboardEvent} event */
   const onKeyDown = event => {
-    switch (normalizeKeyName(event.key)) {
+    switch (event.key) {
       case 'ArrowRight':
         if (onToggleSubmenu) {
           event.stopPropagation();

src/sidebar/components/MenuKeyboardNavigation.js

-import { normalizeKeyName } from '@hypothesis/frontend-shared';
 import { useEffect, useRef } from 'preact/hooks';
 
 /** @param {HTMLElement} element */
@@ -62,7 +61,7 @@ export default function MenuKeyboardNavigation({
 
     let handled = false;
 
-    switch (normalizeKeyName(event.key)) {
+    switch (event.key) {
       case 'ArrowLeft':
       case 'Escape':
         if (closeMenu) {

src/sidebar/components/TagEditor.js

-import {
-  normalizeKeyName,
-  useElementShouldClose,
-  TextInput,
-} from '@hypothesis/frontend-shared';
+import { useElementShouldClose, TextInput } from '@hypothesis/frontend-shared';
 import { useRef, useState } from 'preact/hooks';
 
 import { withServices } from '../service-context';
@@ -172,7 +168,7 @@ function TagEditor({
    * @param {KeyboardEvent} e
    */
   const handleKeyDown = e => {
-    switch (normalizeKeyName(e.key)) {
+    switch (e.key) {
       case 'ArrowUp':
         // Select the previous item in the suggestion list
         changeSelectedItem(-1);