Android: Remove return value from touch event functions

UI/NativeApp.cpp

@@ -1315,17 +1315,17 @@ bool NativeIsAtTopLevel() {
 	}
 }
 
-bool NativeTouch(const TouchInput &touch) {
-	if (screenManager) {
-		// Brute force prevent NaNs from getting into the UI system
-		if (my_isnan(touch.x) || my_isnan(touch.y)) {
-			return false;
-		}
-		screenManager->touch(touch);
-		return true;
-	} else {
-		return false;
+void NativeTouch(const TouchInput &touch) {
+	if (!screenManager) {
+		return;
 	}
+
+	// Brute force prevent NaNs from getting into the UI system.
+	// Don't think this is actually necessary in practice.
+	if (my_isnan(touch.x) || my_isnan(touch.y)) {
+		return;
+	}
+	screenManager->touch(touch);
 }
 
 bool NativeKey(const KeyInput &key) {