Replace systemBackgroundColor for AppleTV (#55131)

Summary:

[UIColor systemBackgroundColor] is unavailable on AppleTV, defaulting to [UIColor clearColor].

Changelog: [internal]

Reviewed By: Abbondanzo

Differential Revision: D90514013

Author: sbuggay

packages/react-native/Libraries/AppDelegate/RCTDefaultReactNativeFactoryDelegate.mm

@@ -59,7 +59,11 @@ - (UIView *)createRootViewWithBridge:(RCTBridge *)bridge
 {
   UIView *rootView = RCTAppSetupDefaultRootView(bridge, moduleName, initProps, YES);
 
+#if TARGET_OS_TV
+  rootView.backgroundColor = [UIColor clearColor];
+#else
   rootView.backgroundColor = [UIColor systemBackgroundColor];
+#endif
 
   return rootView;
 }

packages/react-native/Libraries/AppDelegate/RCTRootViewFactory.mm

@@ -190,7 +190,11 @@ - (UIView *)viewWithModuleName:(NSString *)moduleName
   RCTSurfaceHostingProxyRootView *surfaceHostingProxyRootView =
       [[RCTSurfaceHostingProxyRootView alloc] initWithSurface:surface];
 
+#if TARGET_OS_TV
+  surfaceHostingProxyRootView.backgroundColor = [UIColor clearColor];
+#else
   surfaceHostingProxyRootView.backgroundColor = [UIColor systemBackgroundColor];
+#endif
   if (_configuration.customizeRootView != nil) {
     _configuration.customizeRootView(surfaceHostingProxyRootView);
   }
@@ -207,7 +211,11 @@ - (UIView *)createRootViewWithBridge:(RCTBridge *)bridge
                            initProps:(NSDictionary *)initProps
 {
   UIView *rootView = RCTAppSetupDefaultRootView(bridge, moduleName, initProps, YES);
+#if !TARGET_OS_TV
   rootView.backgroundColor = [UIColor systemBackgroundColor];
+#else
+  rootView.backgroundColor = [UIColor blackColor];
+#endif
   return rootView;
 }