refs: parse_hide_refs_config to use parse_config_key
parse_config_key was introduced in 1b86bbb0 (config: add helper function for parsing key names, 2013-01-22), the NEEDSWORK that is removed in this patch was introduced at daebaa78 (upload/receive-pack: allow hiding ref hierarchies, 2013-01-18), which is only a couple days apart, so presumably the code replaced in this patch was only introduced due to not wanting to wait on the proper helper function being available. Make the condition easier to read by using parse_config_key. Signed-off-by: NStefan Beller <sbeller@google.com> Reviewed-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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