fix(ios): use UIApplicationStateBackground to detact bg status

workaround some ipad in error UIApplicationStateInactive status

Signed-off-by: pingkai <pingkai010@gmail.com>

platform/Apple/source/CicadaPlayer.mm

@@ -151,7 +151,7 @@ - (instancetype)init:(NSString*)traceID opt:(NSDictionary *)opt {
                                                      name:UIApplicationWillTerminateNotification
                                                    object:nil];
 
-        if (UIApplicationStateActive != [[UIApplication sharedApplication] applicationState]) {
+        if (UIApplicationStateBackground == [[UIApplication sharedApplication] applicationState]) {
             self.player->EnterBackGround(true);
         }
 #endif // TARGET_OS_IPHONE