Fixes bundle url reset logic (#43680)

Summary:
Fixes bundle url reset logic

## Changelog:

[IOS] [FIXED] - [Fabric] Fixes bundle url reset logic

Pull Request resolved: #43680

Test Plan: bundle url set works.

Reviewed By: philIip

Differential Revision: D55427061

Pulled By: arushikesarwani94

fbshipit-source-id: 2b26b1f7c51281b7555a8621b97c067eadcf2db3

Author: zhongwuzw

packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTHost.mm

@@ -107,7 +107,7 @@ - (instancetype)initWithBundleURL:(NSURL *)bundleURL
     };
 
     auto bundleURLSetter = ^(NSURL *bundleURL_) {
-      [weakSelf _setBundleURL:bundleURL];
+      [weakSelf _setBundleURL:bundleURL_];
     };
 
     auto defaultBundleURLGetter = ^NSURL *()