Fix output transform rotation direction

This patch makes it so users that have configured their screen with a
transform don't have to update their config after the wlroots breaking
change.

References: swaywm/wlroots#2023

sway/commands/output/transform.c

@@ -50,6 +50,10 @@ struct cmd_results *output_cmd_transform(int argc, char **argv) {
 		return cmd_results_new(CMD_INVALID, "Invalid output transform.");
 	}
 
+	// Sway uses clockwise transforms, while WL_OUTPUT_TRANSFORM_* describe
+	// anti-clockwise transforms
+	transform = invert_rotation_direction(transform);
+
 	struct output_config *output = config->handler_context.output_config;
 	config->handler_context.leftovers.argc = argc - 1;
 	config->handler_context.leftovers.argv = argv + 1;