Warn on ignored touch event

In theory, this was expected to only happen when a touch event is sent
just before the device is rotated, but some devices do not respect the
encoding size, causing an unexpected mismatch.

Refs #1518 <https://github.com/Genymobile/scrcpy/issues/1518>

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

@@ -166,7 +166,7 @@ public class Controller {
 
         Point point = device.getPhysicalPoint(position);
         if (point == null) {
-            // ignore event
+            Ln.w("Ignore touch event, it was generated for a different device size");
             return false;
         }