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/flower.c b/clients/flower.c
index 825c833..389f8be 100644
--- a/clients/flower.c
+++ b/clients/flower.c
@@ -158,8 +158,7 @@
 		   float x, float y, void *data)
 {
 	struct flower *flower = data;
-	window_touch_move(flower->window, input, 
-			  display_get_serial(flower->display));
+	window_move(flower->window, input, display_get_serial(flower->display));
 }
 
 int main(int argc, char *argv[])