Bug 35869: Removes the dismiss button from messages on OPAC SCO module

Bug 35869: Removes the dismiss button from messages on OPAC SCO module

This removes the "Dismiss" button from the SCO module. Currently, the
"Dismiss" button is present, however it does not function properly and
logs the user out if they press it. As noted on previous chats, keeping
the button would require serious changes, thus it's easier just to remove
the functionallity.

To test:
1) Enable  WebBasedSelfCheck
2) Add an OPAC mesaage to a patron account
3) Login to self check ( http://localhost:8080/cgi-bin/koha/sco/sco-main.pl )
4) See the OPAC message, click dismiss.
5) Notice you are logged out at redirected to:
   ( http://localhost:8080/cgi-bin/koha/opac-dismiss-message.pl )
6) Apply patch
7) Log back into the self checkout module
8) Notice that there is no longer a "Dismiss" button for the message.
9) Log into OPAC into the same user's account
10) On the summary page, note that there is still a dismiss button.
11) Ensure this still works properly
12) sign-off

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>