Make gas miner beacons clean up after themselves (#2780)

## About The Pull Request

Change gas miner beacons to be the kind that delete the delivery pod
once they've landed

## Why It's Good For The Game

At ten thousand credits a piece you'd think NT would spring for the
bluespace ones (the pod staying in the chamber is so ugly and I hate it)

## Proof Of Testing

<details>
<summary>Screenshots/Videos</summary>


![image](https://github.com/user-attachments/assets/3e41bb72-34b0-4aa4-9978-61908d3877ab)

</details>

## Changelog

🆑
qol: gas miner delivery pods now delete themselves after landing.
/🆑

modular_skyrat/modules/modular_items/code/summon_beacon.dm

@@ -150,4 +150,3 @@
 	)
 
 	area_string = "atmospherics"
-	supply_pod_stay = TRUE