[PATCH] lib-submodule-update.sh: drop unneeded shell

In modern Git we prefer "git -C <cmd" over "(cd <somewhere && git <cmd>)"
as it doesn't need an extra shell.

Signed-off-by: Stefan Beller <redacted>
---

And because it is in a setup function, we actually save the invocation
of 22 shells for a single run of the whole test suite.

Noticed while adding a lot more in near vincinity, though not as near
to cause merge conflicts, so sending it extra.

Thanks,
Stefan

 t/lib-submodule-update.sh | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 79cdd34a54..915eb4a7c6 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh

@@ -69,10 +69,7 @@ create_lib_submodule_repo () {
 
 		git checkout -b "replace_sub1_with_directory" "add_sub1" &&
 		git submodule update &&
-		(
-			cd sub1 &&
-			git checkout modifications
-		) &&
+		git -C sub1 checkout modifications &&
 		git rm --cached sub1 &&
 		rm sub1/.git* &&
 		git config -f .gitmodules --remove-section "submodule.sub1" &&

-- 
2.11.0.259.g7b30ecf4f0