Remove not needed `userExtensionsHome`

src/vs/workbench/api/node/extHost.protocol.ts

@@ -56,7 +56,6 @@ export interface IEnvironment {
 	appRoot: string;
 	appSettingsHome: string;
 	disableExtensions: boolean;
-	userExtensionsHome: string;
 	extensionDevelopmentPath: string;
 	extensionTestsPath: string;
 }

src/vs/workbench/services/extensions/electron-browser/extensionHost.ts

@@ -369,7 +369,6 @@ export class ExtensionHostProcessWorker {
 					appRoot: this._environmentService.appRoot,
 					appSettingsHome: this._environmentService.appSettingsHome,
 					disableExtensions: this._environmentService.disableExtensions,
-					userExtensionsHome: this._environmentService.extensionsPath,
 					extensionDevelopmentPath: this._environmentService.extensionDevelopmentPath,
 					extensionTestsPath: this._environmentService.extensionTestsPath,
 					// globally disable proposed api when built and not insiders developing extensions