fix mistake (Fit to Fill)

Author: kuznetsov-online

ios/RCTSplashScreen/RCTSplashScreen/RCTSplashScreen.m

@@ -23,7 +23,7 @@ + (void)open:(RCTRootView *)v withImageNamed:(NSString *)imageName {
     UIImageView *view = [[UIImageView alloc]initWithFrame:[UIScreen mainScreen].bounds];
 
     view.image = [UIImage imageNamed:imageName];
-    view.contentMode = UIViewContentModeScaleAspectFit;
+    view.contentMode = UIViewContentModeScaleAspectFill;
 
     [[NSNotificationCenter defaultCenter] removeObserver:rootView  name:RCTContentDidAppearNotification object:rootView];