remove unused import

Author: Alun Turner

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

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import classNames from "classnames";
-import React, { MutableRefObject, ReactNode, useRef } from "react";
+import React, { MutableRefObject, ReactNode } from "react";
 
 import { useComposerFunctions } from "../hooks/useComposerFunctions";
 import { useIsFocused } from "../hooks/useIsFocused";