Bug 35952: Remove unnecessary line for OpacSuppressionMessage

Bug 35952: Remove unnecessary line for OpacSuppressionMessage

To test:
1. Apply patch and restart all
2. Add an additional contetn entry for `OpacSuppressionMessage`, make
   sure it has a publication date in the past.
3. Make sure  OpacSuppression is set to 'hide'.
4. Suppress a record in the OPAC, ( 942$n )
5. Visit the detail page for that record and make sure you
   OpacSuppressionMessage customization displays.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>