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

The section added in e76eec3554 (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>

.github/workflows/main.yml

@@ -23,8 +23,8 @@ jobs:
             --filter=blob:none \
             https://github.com/${{ github.repository }} \
             config-repo &&
-            cd config-repo &&
-            git checkout HEAD -- ci/config
+          cd config-repo &&
+          git checkout HEAD -- ci/config
       - id: check-ref
         name: check whether CI is enabled for ref
         run: |