try to apply gamma LUT in updatemons

this in the case the output was re-enabled

dwl.c

@@ -2567,7 +2567,6 @@ updatemons(struct wl_listener *listener, void *data)
 		if (m->wlr_output->enabled
 				&& !wlr_output_layout_get(output_layout, m->wlr_output))
 			wlr_output_layout_add_auto(output_layout, m->wlr_output);
-
 	/* Now that we update the output layout we can get its box */
 	wlr_output_layout_get_box(output_layout, NULL, &sgeom);
 
@@ -2603,6 +2602,7 @@ updatemons(struct wl_listener *listener, void *data)
 		if ((c = focustop(m)) && c->isfullscreen)
 			resize(c, m->m, 0);
 
+		m->gamma_lut_changed = 1;
 		config_head->state.enabled = 1;
 		config_head->state.mode = m->wlr_output->current_mode;
 		config_head->state.x = m->m.x;