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/transformed.c b/clients/transformed.c
index 54212dd..bbc1dc0 100644
--- a/clients/transformed.c
+++ b/clients/transformed.c
@@ -227,8 +227,7 @@
 		   float x, float y, void *data)
 {
 	struct transformed *transformed = data;
-	window_touch_move(transformed->window, input, 
-			  display_get_serial(transformed->display));
+	window_move(transformed->window, input, display_get_serial(transformed->display));
 }
 
 static void