swap fix

[dragokas]

Please, add appropriate fix for l4d1: https://github.com/alliedmodders/hl2sdk/compare/l4d2...l4d2-swapfix

[Kedarnath-Rothe]

Please assign this issue to me

[peace-maker]

We usually don't assign issues since development moves so slowly - as can be seen by this issue being from 2019 - that there rarely is any duplicate work. Please just open a pull request and reference this issue if you want to work on it!