UW sends \NoSelect in LIST and not in LSUB, which is perfectly fine by

RFCs, but we didn't do that.  For UW IMAP, force a LIST command on each
mailbox, this should also fix the \NoSelect on INBOX if it occurs.

Also updated the check for \NoSelect to include the LIST option as well as
LSUB.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@5102 7612ce4b-ef26-0410-bec9-ea0150e637f0