fix crash on ios

Signed-off-by: Andrey Shovkoplyas <motor4ik@gmail.com>

Author: flexsurfer

ios/StatusIm/AppDelegate.m

@@ -54,7 +54,7 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
 
   self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
   _blankView = [[UIView alloc]initWithFrame:self.window.frame];
-  _blankView.backgroundColor = [UIColor systemBackgroundColor];
+  _blankView.backgroundColor = [UIColor whiteColor];
   _blankView.alpha = 0;
 
   UIViewController *rootViewController = [UIViewController new];