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/events/sentience.dm

@@ -51,7 +51,7 @@
 		SA.key = SG.key
 
 		SA.grant_language(/datum/language/common)
-		SA.flags_2 |= OMNITONGUE_2
+		SET_SECONDARY_FLAG(SA, OMNITONGUE)
 
 		SA.sentience_act()
 

code/modules/events/wizard/curseditems.dm

@@ -5,7 +5,7 @@
 	max_occurrences = 3
 	earliest_start = 0
 
-//Note about adding items to this: Because of how NODROP_1 works if an item spawned to the hands can also be equiped to a slot
+//Note about adding items to this: Because of how NODROP works if an item spawned to the hands can also be equiped to a slot
 //it will be able to be put into that slot from the hand, but then get stuck there. To avoid this make a new subtype of any
 //item you want to equip to the hand, and set its slots_flags = null. Only items equiped to hands need do this.
 
@@ -51,7 +51,7 @@
 				var/obj/item/I = new J //dumb but required because of byond throwing a fit anytime new gets too close to a list
 				H.temporarilyRemoveItemFromInventory(slots[i], TRUE)
 				H.equip_to_slot_or_del(I, wearslots[i])
-				I.flags_1 |= NODROP_1
+				I.flags |= NODROP
 				I.name = "cursed " + I.name
 
 	for(var/mob/living/carbon/human/H in GLOB.living_mob_list)