Remove useless exception declaration

The interface declares it can throw a RemoteException, but the
implementation never throws such exception.

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

@@ -54,7 +54,7 @@ public Device(Options options) {
 
         serviceManager.getWindowManager().registerRotationWatcher(new IRotationWatcher.Stub() {
             @Override
-            public void onRotationChanged(int rotation) throws RemoteException {
+            public void onRotationChanged(int rotation) {
                 synchronized (Device.this) {
                     screenInfo = screenInfo.withDeviceRotation(rotation);