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/mob/dead/new_player/new_player.dm

@@ -4,7 +4,7 @@
 	var/ready = 0
 	var/spawning = 0//Referenced when you want to delete the new_player later on in the code.
 
-	flags_1 = NONE
+	flags = NONE
 
 	invisibility = INVISIBILITY_ABSTRACT
 
@@ -109,7 +109,7 @@
 	if(href_list["ready"])
 		var/tready = text2num(href_list["ready"])
 		//Avoid updating ready if we're after PREGAME (they should use latejoin instead)
-		//This is likely not an actual issue but I don't have time to prove that this
+		//This is likely not an actual issue but I don't have time to prove that this 
 		//no longer is required
 		if(SSticker.current_state <= GAME_STATE_PREGAME)
 			ready = tready

code/modules/mob/dead/observer/observer.dm

@@ -132,13 +132,13 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 /mob/dead/observer/narsie_act()
 	var/old_color = color
 	color = "#960000"
-	animate(src, color = old_color, time = 10, flags_1 = ANIMATION_PARALLEL)
+	animate(src, color = old_color, time = 10, flags = ANIMATION_PARALLEL)
 	addtimer(CALLBACK(src, /atom/proc/update_atom_colour), 10)
 
 /mob/dead/observer/ratvar_act()
 	var/old_color = color
 	color = "#FAE48C"
-	animate(src, color = old_color, time = 10, flags_1 = ANIMATION_PARALLEL)
+	animate(src, color = old_color, time = 10, flags = ANIMATION_PARALLEL)
 	addtimer(CALLBACK(src, /atom/proc/update_atom_colour), 10)
 
 /mob/dead/observer/Destroy()