Update component SASS modules to use newer button-reset mixin

src/styles/annotator/components/AdderToolbar.scss

-@use "../mixins/buttons";
+@use "../../shared/components/buttons";
 @use "../mixins/layout";
 @use "../mixins/molecules";
 @use "../mixins/utils";
@@ -80,7 +80,7 @@ $adder-transition-duration: 80ms;
 
 .AdderToolbar__button {
   @include layout.column($align: center);
-  @include buttons.reset-native-btn-styles;
+  @include buttons.reset;
 
   cursor: pointer;
   color: var.$grey-mid;

src/styles/annotator/components/Toolbar.scss

@@ -2,6 +2,8 @@
 
 @use '../variables' as var;
 
+@use '../../shared/components/buttons' as shared-buttons;
+
 @use '../mixins/buttons';
 @use '../mixins/layout';
 @use '../mixins/utils';
@@ -75,7 +77,7 @@
 
   /** Visible with clean theme */
   .Toolbar__sidebar-close {
-    @include buttons.reset-native-btn-styles;
+    @include shared-buttons.reset;
     @include buttons.button-hover;
     @include utils.border;
     border-right-width: 0;

src/styles/sidebar/components/SelectionTabs.scss

-@use "@hypothesis/frontend-shared/styles/mixins/focus";
+@use "../../shared/components/buttons";
 
-@use "../../mixins/buttons";
 @use "../../mixins/layout";
 @use "../../mixins/utils";
 @use "../../variables" as var;
@@ -26,8 +25,7 @@
 }
 
 .SelectionTabs__type {
-  @include buttons.reset-native-btn-styles;
-  @include focus.outline-on-keyboard-focus;
+  @include buttons.reset;
 
   color: var.$color-text;
   cursor: pointer;