Bug 31743: Change condition for messaging tab

Bug 31743: Change condition for messaging tab

Note for QA:
The code for SMSnumber is still made dependent on
EnhancedMessagingPreferencesOPAC in order to not
disturb current behavior.
This fixes Enhanced on, EnhancedOPAC off; the case of
Enhanced off is not considered here.

Test plan:
Enable EnhancedMessaging, disable EnhancedMessagingOPAC.
Enable TranslateNotices.
Check if you can only change notice language on OPAC.
Enable EnhancedMessagingOPAC.
Check if you change messaging prefs too.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: marie-luce <marie-luce.laflamme@inlibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>