Adjusts all get_temperature() accesses to compare it to a value (#95236)

## About The Pull Request

``get_temperature()`` returns a value in kelvins, not a boolean. Trying
to treat it as such will result in ***any*** item with a thermal value,
like condensers, being treated as a lighter.

## Why It's Good For The Game

Consistency, allows us to have actually functioning cooling items that
don't act like lighters all the time.

## Changelog
🆑
fix: Condensers can no longer be used to ignite things
/🆑

code/modules/surgery/operations/operation_generic.dm

@@ -186,7 +186,7 @@
 		var/obj/item/gun/energy/laser/lasergun = tool
 		return lasergun.cell?.charge > 0
 
-	return tool.get_temperature() > 0
+	return tool.get_temperature() >= FIRE_MINIMUM_TEMPERATURE_TO_EXIST
 
 /datum/surgery_operation/limb/close_skin/on_preop(obj/item/bodypart/limb, mob/living/surgeon, obj/item/tool, list/operation_args)
 	display_results(