Weapon sprite movement when switching weapons isn't interpolated

[Calinou]

• Related to https://github.com/Helion-Engine/Helion/issues/550.

Helion version: https://github.com/Helion-Engine/Helion/commit/3e60de303e27c74738b6e98e125ffb48a552c2cd

Unlike run bobbing, weapon sprite movement when switching weapons isn't interpolated. This also occurs when loading a level or dying, both events causing a weapon switch animation to occur.

https://github.com/Helion-Engine/Helion/assets/180032/4ffaa5da-99ef-4033-a50d-f634d5dbd5a1