Update Mini vMac/ViewController.m to hide the iOS system pointer when running on iOS 13.4

Uses the UIPointerStyle hiddenPointerStyle to set hide the iOS cursor in the pointerInteraction:styleForRegion delegate method. Also returns the defaultRegion in the pointerInteraction:regionForRequest:defaultRegion delegate method instead of returning nil

Co-Authored-By: Jesús A. Álvarez <zydeco@namedfork.net>

Mini vMac/ViewController.m

@@ -45,7 +45,12 @@
         // NSLog(@"Interaction: x2: %hi, y2: %hi", (short)mouseLoc.h, (short)mouseLoc.v);
         [[AppDelegate sharedEmulator] setMouseX:mouseLoc.h Y:mouseLoc.v];
     }
-    return nil;
+    return defaultRegion;
+}
+
+- (UIPointerStyle *)pointerInteraction:(UIPointerInteraction *)interaction styleForRegion:(UIPointerRegion *)region {
+    return [UIPointerStyle hiddenPointerStyle];
+
 }
 #endif