ci: fix code style

In b92cb86ea1 (travis-ci: check that all build artifacts are
.gitignore-d, 2017-12-31), a function was introduced with a code style
that is different from the surrounding code: it added the opening curly
brace on its own line, when all the existing functions in the same file
cuddle that brace on the same line as the function name.

Let's make the code style consistent again.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ci/lib.sh

@@ -69,8 +69,7 @@ skip_good_tree () {
 	exit 0
 }
 
-check_unignored_build_artifacts ()
-{
+check_unignored_build_artifacts () {
 	! git ls-files --other --exclude-standard --error-unmatch \
 		-- ':/*' 2>/dev/null ||
 	{