Fix copyright and hook name

Author: florianduros

res/css/views/rooms/_EmojiButton.pcss

@@ -1,3 +1,19 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 @import "./_MessageComposerButton.pcss";
 
 .mx_EmojiButton {

src/components/views/rooms/wysiwyg_composer/components/Editor.tsx

@@ -16,7 +16,7 @@ limitations under the License.
 
 import React, { forwardRef, memo, ReactNode, RefObject } from 'react';
 
-import { useIsExpanded } from '../hooks/useIsExpended';
+import { useIsExpanded } from '../hooks/useIsExpanded';
 
 const HEIGHT_BREAKING_POINT = 20;