Fix Template for Bridgeless mode (#42781)

Summary:
Pull Request resolved: #42781

Change in [31cf4c4](31cf4c4) broke the template for bridgeless as we changed the signature of a method in the header of `RCTAppDelegate`.

This change aligns the API between RCTAppDelegate and the template's AppDelegate

## Changelog:
[iOS][Fixed] - Align the the bundleURL API from `RCTAppDelegate` to template's `AppDelegate`

Reviewed By: cortinico, dmytrorykun

Differential Revision: D53274434

fbshipit-source-id: 25bad702ba05db2e3a6a9449abbda7d8e2fdb8a0

packages/react-native/template/ios/HelloWorld/AppDelegate.mm

@@ -16,10 +16,10 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
 
 - (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
 {
-  return [self getBundleURL];
+  return [self bundleURL];
 }
 
-- (NSURL *)getBundleURL
+- (NSURL *)bundleURL
 {
 #if DEBUG
   return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index"];