Fixes space vines dying instantly to gas movement (#56567)

I mistakenly copied over space vine code in #55604, and assumed that the default mutation had some sort of cutoff for heat. I was wrong.

Fixes #56552

code/modules/events/spacevine.dm

@@ -574,15 +574,14 @@
 		qdel(src)
 
 /obj/structure/spacevine/should_atmos_process(datum/gas_mixture/air, exposed_temperature)
-	return TRUE
+	return exposed_temperature > FIRE_MINIMUM_TEMPERATURE_TO_SPREAD //if you're cold you're safe
 
 /obj/structure/spacevine/atmos_expose(datum/gas_mixture/air, exposed_temperature)
 	var/volume = air.return_volume()
-	var/override = 0
 	for(var/datum/spacevine_mutation/SM in mutations)
-		override += SM.process_temperature(src, exposed_temperature, volume)
-	if(!override)
-		qdel(src)
+		if(SM.process_temperature(src, exposed_temperature, volume)) //If it's ever true we're safe
+			return
+	qdel(src)
 
 /obj/structure/spacevine/CanAllowThrough(atom/movable/mover, turf/target)
 	. = ..()