Adds a general-purpose Miecz Goodie Pack for Glorious Comrade Defense (#5532)

## About The Pull Request

We're adding more balanced guns back bit by bit, but the Miecz, ever
since the initial guncargo purge of the olden days, got relegated to
security exclusivity. This makes no sense because it's a quirked up
imported Space Polish SMG. This PR fixes that by adding it to cargo, for
a price. Also, to differentiate the security order, the security SMG
order now comes with two instead of just one.

You can also buy magazine singlepacks. Waow. 

also gives it two more rounds per mag. Why was it 18 per? That was such
a weird number.

## Why It's Good For The Game

more stuff to buy is funny and cool. 
## Proof Of Testing

<img width="429" height="394" alt="image"
src="https://github.com/user-attachments/assets/741c4d33-386a-493d-95e4-aab26fbb6abd"
/>


<img width="418" height="192" alt="image"
src="https://github.com/user-attachments/assets/7f25f15a-00ef-45c3-bb7d-79334f0fa557"
/>



</details>

## Changelog
🆑
add: Added a Miecz goodie order, miecz mag goodie, and added an extra
miecz to the sec order
add: two extra bullets to the miecz SMG mag 
/🆑

modular_skyrat/modules/modular_weapons/code/company_and_or_faction_based/szot_dynamica/magazines.dm

@@ -29,7 +29,7 @@
 
 	ammo_type = /obj/item/ammo_casing/c27_54cesarzowa
 	caliber = CALIBER_CESARZOWA
-	max_ammo = 18
+	max_ammo = 20
 
 /obj/item/ammo_box/magazine/miecz/spawns_empty
 	start_empty = TRUE