Fix digi sprite on marine armor subtypes (#2529)

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## About The Pull Request

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## Changelog

:cl:
fix: Marine armor and its subtypes will no longer break digitigrade
/:cl:

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code/modules/clothing/suits/armor.dm

@@ -46,7 +46,7 @@
 	min_cold_protection_temperature = ARMOR_MIN_TEMP_PROTECT
 	heat_protection = CHEST|GROIN|LEGS|FEET|ARMS|HANDS
 	resistance_flags = FIRE_PROOF | ACID_PROOF
-	supports_variations = VOX_VARIATION
+	supports_variations = VOX_VARIATION | DIGITIGRADE_VARIATION_NO_NEW_ICON
 
 /obj/item/clothing/suit/armor/vest/marine/medium
 	name = "medium tactical armor vest"