Increase damage of standard revolver ammo from 55 to 72 (#6123)

# About the pull request
After some testing from myself on a private server and gathering a lot
of feedback from a post i made on the forum.

https://forum.cm-ss13.com/t/m44-rework-making-this-handgun-potent-and-unique-already-unique-in-uscm-weapon/6917
i think M44 is very cool buy lack damage output as an handgun if
comparison to all the other handguns.

why 72 ? because it allow to kill a drone with a full mag and a runner
with three bullet (if you manage to hit them)
it balance itself with the low mag capacity and the lower firing speed
of it.
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# Explain why it's good for the game
because the M44 is cool to use but i also want it to make it a decent
pick if you want to use an handgun.
# 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:
balance: Increase damage of standard revolver ammo from 55 to 72.
balance: Marksman ammo remains 55 damage.
/:cl:

---------

Co-authored-by: Julien <[email protected]>

code/datums/ammo/bullet/revolver.dm

@@ -7,14 +7,13 @@
 /datum/ammo/bullet/revolver
 	name = "revolver bullet"
 	headshot_state = HEADSHOT_OVERLAY_MEDIUM
-
-	damage = 55
+	damage = 72
 	penetration = ARMOR_PENETRATION_TIER_1
 	accuracy = HIT_ACCURACY_TIER_1
 
 /datum/ammo/bullet/revolver/marksman
 	name = "marksman revolver bullet"
-
+	damage = 55
 	shrapnel_chance = 0
 	damage_falloff = 0
 	accurate_range = 12