Fix mac bundling errors (#9848)

Based on
https://github.com/zed-industries/zed/pull/8952#issuecomment-2021693384
and
https://github.com/zed-industries/zed/pull/8952#issuecomment-2022241455

Fixes `./script/bundle-mac -l` workflow errors

* Use proper WebRTC.framework location path (without the arch name dir
in its path)

* Fix `./script/bundle-mac -l` behavior that unconditionally installed
the app and broke it on rerun.
Now the installation is done with `-i` flag only and always cleans up
the target dir (always using `-f` flag logic, hence removed it).


Release Notes:

- N/A