Fix repo re-init in a mirror to not prompt

On a mirror client we don't prompt for user.name,user.email as the
data is only necessary if you will make new commits.  On a re-init
we were testing the command line option, not the existing IsMirror
property from the manifest configuration file.

Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed