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/game/objects/items.dm

@@ -972,7 +972,7 @@
 
 /// If an object can successfully be used as a fire starter it will return a message
 /obj/item/proc/ignition_effect(atom/A, mob/user)
-	if(get_temperature())
+	if(get_temperature() >= FIRE_MINIMUM_TEMPERATURE_TO_EXIST)
 		. = span_notice("[user] lights [A] with [src].")
 	else
 		. = ""