Use SOURCE_MOUSE for scroll events

This might explain why scroll events are sometimes not handled properly.

Refs <https://stackoverflow.com/questions/68954790/why-is-lazycolumn-not-scrollable-using-mouse-but-recycler-view-is>

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -241,7 +241,7 @@ public class Controller {
 
         MotionEvent event = MotionEvent
                 .obtain(lastTouchDown, now, MotionEvent.ACTION_SCROLL, 1, pointerProperties, pointerCoords, 0, 0, 1f, 1f, DEFAULT_DEVICE_ID, 0,
-                        InputDevice.SOURCE_TOUCHSCREEN, 0);
+                        InputDevice.SOURCE_MOUSE, 0);
         return device.injectEvent(event);
     }