[Bug] --wvd-path rejects .wvd files since v2.8.3 (file_okay=False should be True)

With commit `98980fc`, wvd-path's file-okay=false at cli_config.py broke specifying wvd-path.

Steps to Reproduce
   1. Set wvd_path = /path/to/device.wvd in config or pass --wvd-path /path/to/device.wvd
   2. Run any gamdl command
   3. Observe: Error: Invalid value: Directory '...' is a file.

If I set an folder with single wvd file on windows, I keep get permission denied error.