chore: have 'use strict' consistently across our lib files (#14721)

lib/common/api/clipboard.js

@@ -1,3 +1,5 @@
+'use strict'
+
 if (process.platform === 'linux' && process.type === 'renderer') {
   // On Linux we could not access clipboard in renderer process.
   module.exports = require('electron').remote.clipboard

lib/common/api/exports/electron.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const moduleList = require('@electron/internal/common/api/module-list')
 
 exports.memoizedGetter = (getter) => {

lib/common/api/module-list.js

@@ -1,3 +1,5 @@
+'use strict'
+
 // Common modules, please sort alphabetically
 module.exports = [
   { name: 'clipboard', file: 'clipboard' },

lib/common/api/native-image.js

@@ -1 +1,3 @@
+'use strict'
+
 module.exports = process.atomBinding('native_image')

lib/common/api/shell.js

@@ -1 +1,3 @@
+'use strict'
+
 module.exports = process.atomBinding('shell')