completion: use awk for filtering the config entries

Commits 1e0ee4087e (completion: add and use __git_compute_first_level_config_vars_for_section, 2024-02-10) and 6e32f718ff (completion: add and use __git_compute_second_level_config_vars_for_section, 2024-02-10) introduced new helpers for config completion. Both helpers use a pipeline of grep and awk to filter the list of config entries. awk is perfectly capable of filtering, so let's eliminate the grep process and move the filtering into the awk script. The "-E" grep option (extended syntax) was not necessary, as $section is a single word. While at it, wrap the over-long lines to make them more readable. Signed-off-by: Beat Bolli <dev+git@drbeat.li> Signed-off-by: Junio C Hamano <gitster@pobox.com>