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/zombie/items.dm

@@ -4,7 +4,7 @@
 		humans, butchering all other living things to \
 		sustain the zombie, smashing open airlock doors and opening \
 		child-safe caps on bottles."
-	flags_1 = NODROP_1|ABSTRACT_1|DROPDEL_1
+	flags = NODROP|ABSTRACT|DROPDEL
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
 	icon = 'icons/effects/blood.dmi'
 	icon_state = "bloodhand_left"

code/modules/zombie/organs.dm

@@ -55,8 +55,8 @@
 		life has not abandoned your broken form. You can only feel a deep and immutable hunger that \
 		not even death can stop, you will rise again!</span>")
 	var/revive_time = rand(revive_time_min, revive_time_max)
-	var/flags_1 = TIMER_STOPPABLE
-	timer_id = addtimer(CALLBACK(src, .proc/zombify), revive_time, flags_1)
+	var/flags = TIMER_STOPPABLE
+	timer_id = addtimer(CALLBACK(src, .proc/zombify), revive_time, flags)
 
 /obj/item/organ/zombie_infection/proc/zombify()
 	timer_id = null