gitconfig: Fix make gitconfig if USE_BLOBS is disabled

We tested for the presence of .git/modules/3rdparty, which always exists
now because of .git/modules/3rdparty/chrome-ec. Test for .../hooks
instead since that's the actual location for the later activities.

Change-Id: Id5de9f850413c2bc3525faa6cc549641304c3d47
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/13650
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed