Fix `fedpkg local`, removing checked-in duplicate of Source file
    
    (`fedpkg local` failed with "Could not execute local: Error: Attempting a
    download '~/fedora/hunspell-kn/f33/kannada.oxt' that would override a git
    tracked file. Either remove the corresponding line from 'sources' file to keep
    the git tracked one or 'git rm' the file to allow the download.")