Apply default config to output

When starting without any output config, the default config was not
applying.

sway/desktop/output.c

@@ -547,7 +547,7 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 
 	struct output_config *oc = output_find_config(output);
 
-	if (oc && oc->enabled) {
+	if (!oc || oc->enabled) {
 		output_enable(output, oc);
 	}
 

sway/tree/output.c

@@ -253,9 +253,6 @@ struct output_config *output_find_config(struct sway_output *output) {
 		oc = all;
 	}
 
-	if (oc && !oc->enabled) {
-		return NULL;
-	}
 	return oc;
 }