Fixes modular guns not self-recharging until first shot is fired (#22567)

fixes #22025 

- bugfix: "Modular energy guns with a reactor now self-recharge from
assembly, instead of only starting after the first shot is fired."

try_recharge is currently only triggered on fire and loops until charge
is full. this triggers it when a modular gun is completed to initiate
the recharging

code/modules/projectiles/modular/laser_base.dm

@@ -413,6 +413,7 @@
 	A.forceMove(an)
 	an.item = A
 	A.updatetype()
+	A.try_recharge()
 	A.pin = null
 	gun_mods = null
 	focusing_lens = null