OT mortar shells not making any sound

## Testmerges
#6334: 'Xenomorph Endgame' by Git-Nivrak at commit 97b9492b2e
#6071: '[V] Sorokyne Strata: Expanded Small corridors, removed 3000 unused tiles, Xenos can now weed everything except LZ's and surrounding of LZ's, allow LAZ for CAS inside structures with light blue Areas on Tacmap (glass ceiling hallways)' by Venuska1117 at commit 817ed55a47
#6820: 'Updates close backpack icon' by Blundir at commit e6e1e493fa
#6808: 'Attachments resprite' by Blundir at commit cc4fe40905
#7025: 'Fixes giant lizard code breaking when disarmed, and adds some minor features to the mob' by VileBeggar at commit 023f225ddb
#7093: 'ports ipintel subsystem' by harryob at commit 3416fba856

## Round ID
23802

## Description of the bug
solaris ridge, it seems the mortar shells are all silent, while other shells act normal (most of the time normal), not sure if OT shells act different, or no reports because OT shells are more or less rare. Could also be how they are built.

## What's the difference with what should have happened?
Mortar shells should make a sound when you are remotely close to blast range

## How do we reproduce this bug?
make OT shell, fire it nearby, see if it makes a sound. Preferably a 2nd person as xeno to hear

## Attached logs
```
N/A
```

## Additional details
- Author: Master Havoc
- Admin: SmellyHippie
- Note: None