[TF2] Fix thirdperson weapon shell ejection

[NachosChipeados]

Fixes weapon shell ejection coming out of the wrong spot when in thirdperson, by using the fix already used by the minigun's brass particle.

Before:

https://github.com/user-attachments/assets/ffed78d4-3b4a-476f-8784-e3005bc26eb8

After:

https://github.com/user-attachments/assets/eac09fac-6e0d-49b7-aa8d-5c7e0699e38c

[num-get]

When you're looking at other scouts reloading their scattergun, their weapons don't eject any shotgun shells at all. Just my two cents, but the fix should be removing shell ejection from happening when in third person mode.