Add missing UpdateButtonIcon() calls (#22162)

Some calls to UpdateButtonIcon() were missed from
https://github.com/tgstation/tgstation/pull/63836

Fixes #22161.

code/modules/mod/mod_actions.dm

@@ -49,6 +49,7 @@
 	if(!ready && left_click)
 		ready = TRUE
 		button_icon_state = "activate-ready"
+		UpdateButtonIcon()
 		addtimer(CALLBACK(src, PROC_REF(reset_ready)), 3 SECONDS)
 		return
 	var/obj/item/mod/control/mod = target
@@ -59,6 +60,7 @@
 /datum/action/item_action/mod/activate/proc/reset_ready()
 	ready = FALSE
 	button_icon_state = initial(button_icon_state)
+	UpdateButtonIcon()
 
 /datum/action/item_action/mod/module
 	name = "Toggle Module"