Converts Killer Tomatoes to Basic Mobs (#75516)

Just another lightweight PR porting over a simple animal to the basic
mob framework with zero additional AI implementation (it's a killer
tomato- it spawns into the world to maul you. how much more intricate
does it need to be?).

code/datums/ai/basic_mobs/basic_subtrees/speech_subtree.dm

@@ -145,3 +145,9 @@
 	sound = list('sound/creatures/pig1.ogg', 'sound/creatures/pig2.ogg')
 	emote_hear = list("snorts.")
 	emote_see = list("sniffs around.")
+
+/datum/ai_planning_subtree/random_speech/killer_tomato
+	speech_chance = 3
+	speak = list("gnashes.", "growls lowly.", "snarls.")
+	emote_hear = list("gnashes.")
+	emote_see = list("salivates.")