t5509: use a bare repository for test push target

`receive.denyCurrentBranch` currently has a bug where it allows pushing
into non-bare repository using namespaces as long as it does not have any
commits. This would cause t5509 to fail once that bug is fixed because it
pushes into an unborn current branch.

In t5509, no operations are performed inside `pushee`, as it is only a
target for `git push` and `git ls-remote` calls. Therefore it does not
need to have a worktree. So, it is safe to change `pushee` to a bare
repository.

Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t5509-fetch-push-namespaces.sh b/t/t5509-fetch-push-namespaces.sh
index 75cbfcc..e3975bd 100755
--- a/t/t5509-fetch-push-namespaces.sh
+++ b/t/t5509-fetch-push-namespaces.sh
@@ -20,7 +20,7 @@
 	) &&
 	commit0=$(cd original && git rev-parse HEAD^) &&
 	commit1=$(cd original && git rev-parse HEAD) &&
-	git init pushee &&
+	git init --bare pushee &&
 	git init puller
 '