Bug 12293: Correct display for patron messaging preferences on OPAC - bootstrap

This patch is a follow-up for bug 11125, it fixes the bootstrap theme.

Test plan:
1) Remove 'sms' from message_transport_types table.
2) Go on OPAC "My messaging" tab => table columns are out of alignment with table heading.
3) Apply patch => table is correctly displayed.

Signed-off-by: Axelle Clarisse <koha.aixmarseille@gmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
With and without 'sms' existing the display of the table is now correct.
Template only change.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>