Fix touch dragging control panel behavior in 2D mode

- Modify on2DTouchStart() to check dragging state before showing controls
- Prevents controls from appearing during active touch dragging
- Makes touch behavior consistent with mouse dragging behavior
- Controls hide when dragging starts and show when dragging ends
- Resolves issue where touch dragging would show controls while mouse dragging correctly hid them
- Ensures seamless user experience across desktop and mobile devices

vr180-player.js

@@ -990,7 +990,7 @@ function on2DMouseMove() {
 }
 
 function on2DTouchStart() {
-	if (is2DMode) {
+	if (is2DMode && !isDragging) {
 		show2DControlPanel();
 	}
 }