As many users asked, now there is a checkbox inside Tools->Math
called "Auto close brackets, parentheses and braces". This option is
enabled by default, but can be turned off now.

Change-Id: I6f96201c0720fb62fc2dce99222f97194e930fbe
Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/19750Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>