* Updating handle_disease (#80605)
## About The Pull Request
The loop variable was from before we started applying the `as anything`
key and single-letter. Also there was a small runtime which comes from
calling `stage_act` on a cured/deleted disease.
## Why It's Good For The Game
Runtimes bad, updated code good.
## Changelog
N/A
* Updating handle_disease
---------
Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>
cb861b7f02