Revert "[MIRROR] Replace all secondary flags with bitflags stored in the flags_2 var" (#2457)

ok you know what yeah i think i'll properly mirror https://github.com/Citadel-Station-13/Citadel-Station-13/pull/2411

code/modules/assembly/bomb.dm

@@ -8,7 +8,7 @@
 	w_class = WEIGHT_CLASS_NORMAL
 	throw_speed = 2
 	throw_range = 4
-	flags_1 = CONDUCT_1
+	flags = CONDUCT
 	var/status = FALSE   //0 - not readied //1 - bomb finished with welder
 	var/obj/item/device/assembly_holder/bombassembly = null   //The first part of the bomb is an assembly holder, holding an igniter+some device
 	var/obj/item/weapon/tank/bombtank = null //the second part of the bomb is a plasma tank