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/modular_computers/computers/item/laptop.dm

@@ -12,9 +12,6 @@
 	max_hardware_size = 2
 	w_class = WEIGHT_CLASS_NORMAL
 
-	// No running around with open laptops in hands.
-	flags_2 = SLOWS_WHILE_IN_HAND_2
-
 	screen_on = 0 		// Starts closed
 	var/start_open = TRUE	// unless this var is set to 1
 	var/icon_state_closed = "laptop-closed"
@@ -24,6 +21,9 @@
 /obj/item/device/modular_computer/laptop/Initialize()
 	. = ..()
 
+	// No running around with open laptops in hands.
+	SET_SECONDARY_FLAG(src, SLOWS_WHILE_IN_HAND)
+
 	if(start_open && !screen_on)
 		toggle_open()