[TF2] Fix the weapon being invisible after the stun period expires

[TheNotoriousFrogposter]

When a stun is applied to the player, the weapon is set to be invisible. But after the stun is over, there isn't any code to set the weapon back to the visible state. This PR fixes this.

Before:

2025-04-17.11-17-30.mp4

After:

2025-04-17.11-14-11.mp4

[HyperionCoding]

I could see this easily conflicting with other conditions or content creators wanting to set weapon invisible.

[Bradasparky]

I could see this easily conflicting with other conditions or content creators wanting to set weapon invisible.

This is true, however content creators get around this by setting weapon visibility on tick. See VSH as an example with Hale's fists.

Even so, these checks aren't sufficient enough to make sure you're setting weapon visibility as harmlessly and least often as possible. You should specifically be checking for TF_STUN_CONTROLS and TF_STUN_LOSER_STATE because those are the only two which affect weapon visibility. For example, getting slowed by a Sandman ball doesn't change weapon visibility. This code should also be moved into ConditionThink where you have access to the specific stuns before the condition is removed.