iOS: Switch to the same screen dimming logic as Windows/Android

ios/ViewController.mm

@@ -559,8 +559,6 @@ int ToTouchID(UITouch *uiTouch, bool allowAllocate) {
 
 		if ([[GCController controllers] count] > 0) {
 			[self setupController:[[GCController controllers] firstObject]];
-		} else {
-			[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
 		}
 	}
 }
@@ -590,8 +588,6 @@ int ToTouchID(UITouch *uiTouch, bool allowAllocate) {
 		return;
 	}
 
-	[[UIApplication sharedApplication] setIdleTimerDisabled:YES];   // prevent auto-lock
-
 	self.gameController.controllerPausedHandler = ^(GCController *controller) {
 		KeyInput key;
 		key.flags = KEY_DOWN;

ios/main.mm

@@ -437,6 +437,12 @@ bool System_MakeRequest(SystemRequestType type, int requestId, const std::string
 		[sharedViewController shareText:text];
 		return true;
 	}
+	case SystemRequestType::SET_KEEP_SCREEN_BRIGHT:
+        dispatch_async(dispatch_get_main_queue(), ^{
+            INFO_LOG(SYSTEM, "SET_KEEP_SCREEN_BRIGHT: %d", (int)param3);
+            [[UIApplication sharedApplication] setIdleTimerDisabled: (param3 ? YES : NO)];
+        });
+		return true;
 	default:
 		return false;
 	}