Revert "Load iOS dart bundle by URL fallback (#22997)" (#23054)

This reverts commit 9df21576.

shell/platform/darwin/ios/framework/Source/FlutterDartProject.mm

@@ -43,11 +43,6 @@ flutter::Settings FLTDefaultSettingsForBundle(NSBundle* bundle) {
   if (bundle == nil) {
     bundle = [NSBundle bundleWithIdentifier:[FlutterDartProject defaultBundleIdentifier]];
   }
-  if (bundle == nil) {
-    // The bundle isn't loaded and can't be found by bundle ID. Find it by path.
-    bundle = [NSBundle bundleWithURL:[NSBundle.mainBundle.privateFrameworksURL
-                                         URLByAppendingPathComponent:@"App.framework"]];
-  }
   if (bundle == nil) {
     bundle = mainBundle;
   }
@@ -244,16 +239,11 @@ flutter::Settings FLTDefaultSettingsForBundle(NSBundle* bundle) {
     bundle = [NSBundle bundleWithIdentifier:[FlutterDartProject defaultBundleIdentifier]];
   }
   if (bundle == nil) {
-    // The bundle isn't loaded and can't be found by bundle ID. Find it by path.
-    bundle = [NSBundle bundleWithURL:[NSBundle.mainBundle.privateFrameworksURL
-                                         URLByAppendingPathComponent:@"App.framework"]];
+    bundle = [NSBundle mainBundle];
   }
   NSString* flutterAssetsName = [bundle objectForInfoDictionaryKey:@"FLTAssetsPath"];
-  if (bundle == nil) {
-    bundle = [NSBundle mainBundle];
+  if (flutterAssetsName == nil) {
     flutterAssetsName = @"Frameworks/App.framework/flutter_assets";
-  } else if (flutterAssetsName == nil) {
-    flutterAssetsName = @"flutter_assets";
   }
   return flutterAssetsName;
 }