Don't show the "only me" icon when annotation is being edited

Do not render the only-me icon while an annotation is being edited, as
the user can switch privacy settings in the editing mode, and those
changes could be at odds with "only me."

src/sidebar/components/annotation-header.js

@@ -49,7 +49,7 @@ export default function AnnotationHeader({
   return (
     <header className="annotation-header">
       <div className="annotation-header__row">
-        {annotationIsPrivate && (
+        {annotationIsPrivate && !isEditing && (
           <SvgIcon
             className="annotation-header__icon"
             name="lock"

src/sidebar/components/test/annotation-header-test.js

@@ -61,6 +61,15 @@ describe('AnnotationHeader', () => {
 
       assert.isTrue(wrapper.find('SvgIcon').filter({ name: 'lock' }).exists());
     });
+
+    it('should not render an "Only Me" icon if the annotation is being edited', () => {
+      fakeIsPrivate.returns(true);
+
+      const wrapper = createAnnotationHeader({ isEditing: true });
+
+      assert.isFalse(wrapper.find('SvgIcon').filter({ name: 'lock' }).exists());
+    });
+
     it('should not render an "Only Me" icon if the annotation is not private', () => {
       fakeIsPrivate.returns(false);