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

lib/renderer/api/desktop-capturer.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const { ipcRenderer, nativeImage } = require('electron')
 
 const includes = [].includes

lib/renderer/api/exports/electron.js

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

lib/renderer/api/module-list.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const features = process.atomBinding('features')
 
 // Renderer side modules, please sort alphabetically.

lib/renderer/api/screen.js

@@ -1 +1,3 @@
+'use strict'
+
 module.exports = require('electron').remote.screen