fix for only_country Custom

Merged Philip Müller requested to merge fhdk:fix-only-country-full-custom-path into master

Created by: fhdk

In load_server_lists() when configuration is Custom the configuration is set to contain the full file path.

This fix changes this behavior by adding a mirror_dir variable to query_servers(). The fix also changes the validation of the custom mirror file in load_server_lists().

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