westoy: Remove window_touch_move

It seems to be the same as window_move, except it ignores the passed
in serial (???) and instead just uses the one of the display.
diff --git a/clients/fullscreen.c b/clients/fullscreen.c
index 72e2c81..034a352 100644
--- a/clients/fullscreen.c
+++ b/clients/fullscreen.c
@@ -283,8 +283,7 @@
 		   float x, float y, void *data)
 {
 	struct fullscreen *fullscreen = data;
-	window_touch_move(fullscreen->window, input, 
-			  display_get_serial(fullscreen->display));
+	window_move(fullscreen->window, input, display_get_serial(fullscreen->display));
 }
 
 static void