Merge pull request #11723 from Ccomp5950/canisters

Canisters now work in unpowered areas.

code/game/machinery/atmoalter/canister.dm

@@ -17,6 +17,7 @@
 	var/temperature_resistance = 1000 + T0C
 	volume = 1000
 	use_power = 0
+	interact_offline = 1 // Allows this to be used when not in powered area.
 	var/release_log = ""
 	var/update_flag = 0