Energy weapons spawned with empty cells now use the cell behavior for…

… it (#3638)

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## About The Pull Request

yeah

## Why It's Good For The Game

saves 2 lines

## Changelog

:cl:
code: empty energy weapons now get emptied slightly differently, no
player-facing changes
/:cl:

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Signed-off-by: Theos <[email protected]>

code/modules/projectiles/guns/energy.dm

@@ -67,9 +67,7 @@
 			default_ammo_type = FALSE
 
 	if(default_ammo_type)
-		cell = new default_ammo_type(src)
-	if(spawn_no_ammo)
-		cell.use(cell.maxcharge)
+		cell = new default_ammo_type(src, spawn_no_ammo)
 	update_ammo_types()
 	recharge_newshot(TRUE)
 	if(selfcharge)