[MIRROR] clean up flags (Requires #11623 Merged First) (#11637)

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/game/objects/structures/ledges.dm

@@ -16,7 +16,7 @@
 
 /obj/structure/ledge_corner
 	icon_state = "ledge-corner"
-	flags = 0
+	flags = NONE
 	name = "rock ledge"
 	desc = "An easily scaleable rocky ledge."
 	icon = 'icons/obj/ledges.dmi'

code/game/objects/structures/low_wall.dm

@@ -397,7 +397,7 @@
 	icon_state = "preview_glass"
 	basestate = "window"
 	alpha = 180
-	flags = 0
+	flags = NONE
 	fulltile = TRUE
 	maxhealth = 24
 	glasstype = /obj/item/stack/material/glass

code/game/objects/structures/window.dm

@@ -448,7 +448,7 @@
 		icon_state = "[basestate]"
 		return
 	else
-		flags = 0 // Removes ON_BORDER and OPPOSITE_OPACITY
+		flags = NONE // Removes ON_BORDER and OPPOSITE_OPACITY
 	var/list/dirs = list()
 	if(anchored)
 		for(var/obj/structure/window/W in orange(src,1))
@@ -494,7 +494,7 @@
 	icon_state = "window-full"
 	maxhealth = 24
 	fulltile = TRUE
-	flags = 0
+	flags = NONE
 
 /obj/structure/window/phoronbasic
 	name = "phoron window"
@@ -512,7 +512,7 @@
 	icon_state = "phoronwindow-full"
 	maxhealth = 80
 	fulltile = TRUE
-	flags = 0
+	flags = NONE
 
 /obj/structure/window/phoronreinforced
 	name = "reinforced borosilicate window"
@@ -531,7 +531,7 @@
 	icon_state = "phoronrwindow-full"
 	maxhealth = 160
 	fulltile = TRUE
-	flags = 0
+	flags = NONE
 
 /obj/structure/window/reinforced
 	name = "reinforced window"
@@ -549,7 +549,7 @@
 	icon_state = "rwindow-full"
 	maxhealth = 80
 	fulltile = TRUE
-	flags = 0
+	flags = NONE
 
 /obj/structure/window/reinforced/tinted
 	name = "tinted window"
@@ -587,7 +587,7 @@
 	icon_state = "rwindow-full"
 	maxhealth = 80
 	fulltile = TRUE
-	flags = 0
+	flags = NONE
 
 /obj/structure/window/reinforced/polarized/attackby(obj/item/W as obj, mob/user as mob)
 	if(istype(W, /obj/item/multitool) && !anchored) // Only allow programming if unanchored!