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/game/objects/items/weapons/kitchen.dm

@@ -24,7 +24,7 @@
 	throw_speed = 3
 	throw_range = 5
 	materials = list(MAT_METAL=80)
-	flags_1 = CONDUCT_1
+	flags = CONDUCT
 	attack_verb = list("attacked", "stabbed", "poked")
 	hitsound = 'sound/weapons/bladeslice.ogg'
 	armor = list(melee = 0, bullet = 0, laser = 0, energy = 0, bomb = 0, bio = 0, rad = 0, fire = 50, acid = 30)
@@ -56,7 +56,7 @@
 	name = "kitchen knife"
 	icon_state = "knife"
 	desc = "A general purpose Chef's Knife made by SpaceCook Incorporated. Guaranteed to stay sharp for years to come."
-	flags_1 = CONDUCT_1
+	flags = CONDUCT
 	force = 10
 	w_class = WEIGHT_CLASS_SMALL
 	throwforce = 10
@@ -95,7 +95,7 @@
 	name = "butcher's cleaver"
 	icon_state = "butch"
 	desc = "A huge thing used for chopping and chopping up meat. This includes clowns and clown by-products."
-	flags_1 = CONDUCT_1
+	flags = CONDUCT
 	force = 15
 	throwforce = 10
 	materials = list(MAT_METAL=18000)