Convert some bools to TRUE/FALSE instead of 1/0. (#11100)

Co-authored-by: Aronai Sieyes <arokha@arokha.com>

code/game/objects/structures/safe.dm

@@ -10,8 +10,8 @@ FLOOR SAFES
 	desc = "A huge chunk of metal with a dial embedded in it. Fine print on the dial reads \"Scarborough Arms - 2 tumbler safe, guaranteed thermite resistant, explosion resistant, and assistant resistant.\""
 	icon = 'icons/obj/structures.dmi'
 	icon_state = "safe"
-	anchored = 1
-	density = 1
+	anchored = TRUE
+	density = TRUE
 	var/open = 0		//is the safe open?
 	var/tumbler_1_pos	//the tumbler position- from 0 to 72
 	var/tumbler_1_open	//the tumbler position to open at- 0 to 72
@@ -170,7 +170,7 @@ FLOOR SAFES
 /obj/structure/safe/floor
 	name = "floor safe"
 	icon_state = "floorsafe"
-	density = 0
+	density = FALSE
 	level = 1	//underfloor
 	plane = PLATING_PLANE
 	layer = ABOVE_UTILITY