fix(Xcode:AppDelegate): fix the response to no longer be just YES

As per crazycodeboy/react-native-splash-screen#606 (comment)

Author: RicardasN

packages/sdk-apple/src/objectiveCParser.ts

@@ -73,10 +73,10 @@ export const parseAppDelegate = (
         // You can add your custom initial props in the dictionary below.
         // They will be passed down to the ViewController used by React Native.
         self.initialProps = @{};
-        [super application:application didFinishLaunchingWithOptions:launchOptions];
+        bool didFinish=[super application:application didFinishLaunchingWithOptions:launchOptions];
                 `,
                     render: (v) => `${v};`,
-                    end: 'return YES;',
+                    end: 'return didFinish;',
                 },
                 sourceURLForBridge: {
                     isRequired: true,