Correct fix

Annoying, since this is not a checkbox, so we need to do extra work to
make sure we are doing a 0 <-> 1 conversion (since it is stored as a
string, not an integer, so it is a pain to flip the value since "0" is
not empty-ish in javascript).

Making the value -1 is not correct, since this is expected to be 0 or 1.
Fix number of deleted messages

Signed-off-by: Michael M Slusarz <slusarz@horde.org>
Fix size translation

Signed-off-by: Michael M Slusarz <slusarz@horde.org>
Correct rte_sig validation

Signed-off-by: Michael M Slusarz <slusarz@horde.org>