config API: use get_error_routine(), not vreportf()

config API: use get_error_routine(), not vreportf()

Change the git_die_config() function added in 5a80e97c827 (config: add
`git_die_config()` to the config-set API, 2014-08-07) to use the
public callbacks in the usage.[ch] API instead of the the underlying
vreportf() function.

In preceding commits the rest of the vreportf() users outside of
usage.c was migrated to die_message(), so we can now make it "static".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>