Fixed Runtime in simple_animal_vr.dm,41: Cannot read null.digest_mode

- Caused by using "Toggle Animal's Digestion" verb on non-vore-capable mobs.
- Even better, changed it to not even add those verbs on mobs without vore
- Also remove the path from VV addverb since it is a proc now.

code/modules/mob/living/simple_mob/simple_mob_vr.dm

@@ -198,6 +198,10 @@
 	if(LAZYLEN(vore_organs))
 		return
 
+	// Since they have bellies, add verbs to toggle settings on them.
+	verbs |= /mob/living/simple_mob/proc/toggle_digestion
+	verbs |= /mob/living/simple_mob/proc/toggle_fancygurgle
+
 	//A much more detailed version of the default /living implementation
 	var/obj/belly/B = new /obj/belly(src)
 	vore_selected = B