CloneWithCommitMsgHook: Fix HTTP clone command inconsistency

When cloning a project using HTTP schema, the "/a" in the URL was added
only when choosing to clone without the commit hook. Now the URL is the
same in both cases.

Change-Id: I8fc0667f17cea592bd702a0441cba7ca3f762968
(cherry picked from commit d632d6471b42a47877664a5266ba509026538a32)