M85A1 (grenade launcher), the grenade remains in the same tile from where it was fired.

### Testmerges

#10999: 'Fix of various plane related issues' by Blundir at commit f85a7153c4 #10908: 'Adds additional checks to pouncing up a z level' by Git-Nivrak at commit 040e0c0f87 #10925: 'Cape River Mining Colony - Ground Map' by Steelpoint at commit 7e02380a3a #11326: 'Fixes facehuggers ignoring hug proof equipment.' by realforest2001 at commit 85a2ce4287 #11290: 'Ice v2 multizboogaloo DO NOT MERGE' by cuberound at commit 3d9874f958 #10623: 'A.S.S - Assault, Support, Security' by Git-Nivrak at commit 9dc240f905 #11170: '[WIP] Yautja Survivor' by realforest2001 at commit 78a8bf0863

### Round ID

_No response_

### Description of the bug

When firing a grenade launcher, there is a small chance that the grenade will remain in the same place where it was fired.
(I guess, that may happen when you step to its projectile direction simultaneously with firing it)
(Sorry for resolution, my OBS goes crazy for no reason)

https://github.com/user-attachments/assets/30068b08-eabe-44f6-b1b7-80335fd23246

### What's the difference with what should have happened?

Nade must fly.

### How do we reproduce this bug?

1. Load a nade in gl.
2. Wield.
3. Shoot.
4. Take a step in the direction of the projectile (?).
5. Repeat until the grenade falls.

### Issue Bingo

- [x] Issue could be reproduced at least once
- [x] Issue happened in a recent (less than 7 days ago) round
- [x] Couldn't find an existing issue about this (https://github.com/cmss13-devs/cmss13/issues)