Revert "feat: only allow bundled preload scripts (#17308)" (#18091)

This reverts commit 8cf15cc931.

lib/renderer/init.ts

@@ -1,5 +1,4 @@
 import { EventEmitter } from 'events'
-import * as fs from 'fs'
 import * as path from 'path'
 
 const Module = require('module')
@@ -191,22 +190,10 @@ if (nodeIntegration) {
 }
 
 const errorUtils = require('@electron/internal/common/error-utils')
-const { isParentDir } = require('@electron/internal/common/path-utils')
-
-let absoluteAppPath: string
-const getAppPath = function () {
-  if (absoluteAppPath === undefined) {
-    absoluteAppPath = fs.realpathSync(appPath!)
-  }
-  return absoluteAppPath
-}
 
 // Load the preload scripts.
 for (const preloadScript of preloadScripts) {
   try {
-    if (!isParentDir(getAppPath(), fs.realpathSync(preloadScript))) {
-      throw new Error('Preload scripts outside of app path are not allowed')
-    }
     Module._load(preloadScript)
   } catch (error) {
     console.error(`Unable to load preload script: ${preloadScript}`)