RN: Fix Lint for FocusEventsExample.android.js (#51857)

Summary:
Pull Request resolved: #51857

Fixes lint warnings for `FocusEventsExample.android.js`.

Changelog:
[Internal]

Reviewed By: NickGerleman

Differential Revision: D76074712

fbshipit-source-id: 10af22f75f03462af35a4fe5e592f8bc8bdc0ca8

Author: yungsters

packages/rn-tester/js/examples/FocusEventsExample/FocusEventsExample.android.js

@@ -4,12 +4,10 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @flow
+ * @flow strict-local
  * @format
  */
 
-'use strict';
-
 import RNTesterText from '../../components/RNTesterText';
 import {useState} from 'react';
 import {Alert, Pressable, StyleSheet, TextInput, View} from 'react-native';
@@ -63,7 +61,6 @@ const ViewExample = () => {
 };
 
 const PressableExample = () => {
-  const [highlightFocused, setHighlightFocused] = useState(false);
   const [pressableFocused, setPressableFocused] = useState(false);
   const [disabledPressableFocused, setDisabledPressableFocused] =
     useState(false);