Fix restorecon exec on /var/lib/git

The restorecon command for selinux needed to require /var/lib/git
and the syntax is actually "File" rather than "Folder" here.

Also added refreshonly so it only runs when /var/lib/git changes.

Change-Id: I88f40dc3051d66ef9f9dc4d667474b8cc7d2a5f7
Merge "Fix restorecon exec on /var/lib/git"