restaurant portal can be moved w/ wrench (#690)

## About The Pull Request

The portals that spawn the tourist bots can be unbolted from the floor,
pulled around, and rebolted somewhere else.

## Why It's Good For The Game

These things are immovable and it gets annoying when you have to build
around them because of that, especially if you don't even use them.

I initially made them destructible but this is a far better fix

## Changelog

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🆑
:qol: restaurant portal can bolted and unbolted
/🆑

code/modules/food_and_drinks/restaurant/_venue.dm

@@ -171,6 +171,11 @@
 	/// A weak reference to the mob who turned on the portal
 	var/datum/weakref/turned_on_portal
 
+/obj/machinery/restaurant_portal/wrench_act(mob/living/user, obj/item/tool)
+	. = ..()
+	default_unfasten_wrench(user, tool)
+	return TOOL_ACT_TOOLTYPE_SUCCESS
+
 /obj/machinery/restaurant_portal/Initialize(mapload)
 	. = ..()
 	if(linked_venue)