[MIRROR] Minerals have been refactored so costs and minerals in items are now in terms of mineral defines. [MDB IGNORE] (#20916)

* Minerals have been refactored so costs and minerals in items are now in terms of mineral defines.

* AI GEN RUN ONE

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Co-authored-by: ArcaneMusic <41715314+ArcaneMusic@users.noreply.github.com>
Co-authored-by: Gandalf <9026500+Gandalf2k15@users.noreply.github.com>

code/game/objects/structures/plaques/_plaques.dm

@@ -7,7 +7,7 @@
 	opacity = FALSE
 	density = FALSE
 	layer = SIGN_LAYER
-	custom_materials = list(/datum/material/gold = 2000)
+	custom_materials = list(/datum/material/gold =SHEET_MATERIAL_AMOUNT)
 	max_integrity = 200 //Twice as durable as regular signs.
 	armor_type = /datum/armor/structure_plaque
 	///Custom plaque structures and items both start "unengraved", once engraved with a fountain pen their text can't be altered again. Static plaques are already engraved.
@@ -121,7 +121,7 @@
 	name = "blank plaque"
 	desc = "A blank plaque, use a fancy pen to engrave it. It can be placed on a wall."
 	w_class = WEIGHT_CLASS_NORMAL
-	custom_materials = list(/datum/material/gold = 2000)
+	custom_materials = list(/datum/material/gold =SHEET_MATERIAL_AMOUNT)
 	max_integrity = 200
 	armor_type = /datum/armor/item_plaque
 	///This points the item to make the proper structure when placed on a wall.

code/game/objects/structures/plaques/static_plaques.dm

@@ -159,5 +159,5 @@
 	of other passengers, and unforeseen circumstances such as foul play or mechanical issues.<br><br>\
 	By entering the tram, guideway, or crossings you agree Nanotrasen is not liable for any injuries, damages, or losses that may occur. If you do not agree to these terms, please do not use the tram.<br>"
 	icon_state = "commission_tram"
-	custom_materials = list(/datum/material/titanium = 2000)
+	custom_materials = list(/datum/material/titanium =SHEET_MATERIAL_AMOUNT)
 	plane = FLOOR_PLANE