Buffs MP and Officer Armor's Bullet Armour (#6838)

# About the pull request
Small simple change, some additional clean
MPs and derived Officer Armour now gets Medium Bullet Armour (20)
Instead of Low (10).
Also removed some redundant armour variables that clarified it was the
same level already being derived from.
Also moved icon_state of Warden and Chief MP around to be in the same
order as most others.
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# Explain why it's good for the game
MP and Officer Armor is already limited and restricted to certain roles,
it shouldn't be worse than standard.
And MPs gear should lean toward human threat rather than anything else.
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl: MistChristmas
balance: Buffed MP and Officer Armor's Bullet Armour.
/:cl:

code/modules/clothing/suits/marine_armor/_marine_armor.dm

@@ -254,7 +254,7 @@
 	desc = "A standard Colonial Marines M2 Pattern Chestplate. Protects the chest from ballistic rounds, bladed objects and accidents. It has a small leather pouch strapped to it for limited storage."
 	icon_state = "mp_armor"
 	armor_melee = CLOTHING_ARMOR_MEDIUMHIGH
-	armor_bullet = CLOTHING_ARMOR_LOW
+	armor_bullet = CLOTHING_ARMOR_MEDIUM
 	armor_laser = CLOTHING_ARMOR_LOW
 	armor_energy = CLOTHING_ARMOR_LOW
 	armor_bomb = CLOTHING_ARMOR_MEDIUM
@@ -287,19 +287,17 @@
 	black_market_value = 20
 
 /obj/item/clothing/suit/storage/marine/MP/warden
-	icon_state = "warden"
 	name = "\improper M3 pattern warden MP armor"
 	desc = "A well-crafted suit of M3 Pattern Armor typically distributed to Wardens. Useful for letting your men know who is in charge."
-	armor_bio = CLOTHING_ARMOR_MEDIUMLOW
-	armor_rad = CLOTHING_ARMOR_MEDIUMLOW
+	icon_state = "warden"
 	uniform_restricted = list(/obj/item/clothing/under/marine/warden)
 	specialty = "M3 pattern warden MP"
 	item_state_slots = list(WEAR_JACKET = "warden")
 
 /obj/item/clothing/suit/storage/marine/MP/WO
-	icon_state = "warrant_officer"
 	name = "\improper M3 pattern chief MP armor"
 	desc = "A well-crafted suit of M3 Pattern Armor typically distributed to Chief MPs. Useful for letting your men know who is in charge."
+	icon_state = "warrant_officer"
 	uniform_restricted = list(/obj/item/clothing/under/marine/officer/warrant)
 	specialty = "M3 pattern chief MP"
 	item_state_slots = list(WEAR_JACKET = "warrant_officer")