Don't set ignoreMaximumSize on preview jobs for slow files
With this change (plus frameworks/kio!702 (merged)), slow files will be treated as remote files for generating previews. This should make browsing local mounts of remote locations smoother.
With this change (plus frameworks/kio!702 (merged)), slow files will be treated as remote files for generating previews. This should make browsing local mounts of remote locations smoother.