Fix heretic rune layering by using pixel_z (#80990)

## About The Pull Request

Fix items layering above heretic runes by making it use pixel_z rather
than pixel_y.


![image](https://github.com/tgstation/tgstation/assets/51863163/302d60df-cf4e-4a0d-b00e-7d6e42fb741a)

## Changelog

🆑 Melbert
fix: Items and mobs no longer hide behind big runes (heretic, cult,
wizard)
/🆑

code/modules/antagonists/cult/runes.dm

@@ -574,7 +574,8 @@ structure_check() searches for nearby cultist structures required for the invoca
 	color = RUNE_COLOR_DARKRED
 	icon_state = "rune_large"
 	pixel_x = -32 //So the big ol' 96x96 sprite shows up right
-	pixel_y = -32
+	pixel_y = 16
+	pixel_z = -48
 	scribe_delay = 50 SECONDS //how long the rune takes to create
 	scribe_damage = 40.1 //how much damage you take doing it
 	log_when_erased = TRUE
@@ -1074,7 +1075,8 @@ GLOBAL_VAR_INIT(narsie_summon_count, 0)
 	icon = 'icons/effects/96x96.dmi'
 	icon_state = "apoc"
 	pixel_x = -32
-	pixel_y = -32
+	pixel_y = 16
+	pixel_z = -48
 	color = RUNE_COLOR_DARKRED
 	req_cultists = 3
 	scribe_delay = 100

code/modules/antagonists/heretic/transmutation_rune.dm

@@ -204,8 +204,9 @@
 /obj/effect/heretic_rune/big
 	icon = 'icons/effects/96x96.dmi'
 	icon_state = "transmutation_rune"
-	pixel_x = -33 //So the big ol' 96x96 sprite shows up right
-	pixel_y = -32
+	pixel_x = -30
+	pixel_y = 18
+	pixel_z = -48
 	greyscale_config = /datum/greyscale_config/heretic_rune
 
 /obj/effect/heretic_rune/big/Initialize(mapload, path_colour)
@@ -217,8 +218,9 @@
 	duration = 30 SECONDS
 	icon = 'icons/effects/96x96.dmi'
 	icon_state = "transmutation_rune"
-	pixel_x = -33
-	pixel_y = -32
+	pixel_x = -30
+	pixel_y = 18
+	pixel_z = -48
 	plane = GAME_PLANE
 	layer = SIGIL_LAYER
 	greyscale_config = /datum/greyscale_config/heretic_rune

code/modules/antagonists/wizard/grand_ritual/grand_ritual.dm

@@ -295,8 +295,9 @@
 /obj/effect/temp_visual/wizard_rune
 	icon = 'icons/effects/96x96.dmi'
 	icon_state = null
-	pixel_x = -28
-	pixel_y = -33
+	pixel_x = -33
+	pixel_y = 16
+	pixel_z = -48
 	anchored = TRUE
 	layer = SIGIL_LAYER
 	plane = GAME_PLANE

code/modules/antagonists/wizard/grand_ritual/grand_rune.dm

@@ -15,8 +15,9 @@
 	desc = "A flowing circle of shapes and runes is etched into the floor, the lines twist and move before your eyes."
 	icon = 'icons/effects/96x96.dmi'
 	icon_state = "wizard_rune"
-	pixel_x = -28
-	pixel_y = -33
+	pixel_x = -33
+	pixel_y = 16
+	pixel_z = -48
 	anchored = TRUE
 	interaction_flags_atom = INTERACT_ATOM_ATTACK_HAND
 	resistance_flags = FIRE_PROOF | UNACIDABLE | ACID_PROOF