ci: fix indentation of the `ci-config` job

The section added in e76eec35540f (ci: allow per-branch config for GitHub Actions, 2020-05-07) contains a `&&`-chain that connects several commands. The first command is actually so long that it stretches over multiple lines, and as per usual, the continuation lines are indented one more level than the first. However, the subsequent commands in the `&&`-chain were also indented one more level than the first command, which was almost certainly unintended. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Acked-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>