Drop Pouch Buff (#5902)

# About the pull request

The intention behind this PR is to see the drop pouch used more often as
a middle ground between the magazine webbing and large webbing. Adds two
more small item spaces (one medium item space). The drop pouch carries
either two large items (unchanged), four medium sized items, or eight
small items.

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# Explain why it's good for the game

The drop pouch is rarely ever used, mostly by smartgunners who need a
few extra drums. This should change that. It brings the drop pouch up
from a niche "(worse) large pouch but for your webbing slot" to a
middler between the magazine webbing and large webbing, mag webbing is
still better for packing mags, like it always has been, and large
webbing is still better for packing medium sized items, which are most
of the items a marine would be packing.
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

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screenshots and the `<details>` tags.

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# Changelog
:cl: Stakeyng
balance: Drop pouch has more space (2 large (unchanged), 4 medium, 8
small)
/:cl:

---------

Co-authored-by: private-tristan <[email protected]>

code/modules/clothing/under/ties.dm

@@ -751,7 +751,7 @@
 	w_class = SIZE_LARGE //Allow storage containers that's medium or below
 	storage_slots = null
 	max_w_class = SIZE_MEDIUM
-	max_storage_space = 6 //weight system like backpacks, hold enough for 2 medium (normal) size items, or 3 small items, or 6 tiny items
+	max_storage_space = 8 //weight system like backpacks, hold enough for 2 medium (normal) size items, or 4 small items, or 8 tiny items
 	cant_hold = list( //Prevent inventory powergame
 		/obj/item/storage/firstaid,
 		/obj/item/storage/bible,