Fix for Bug 7024 - Can't delete other library's messages with AllowAllMessageDeletion on

Fix for Bug 7024 - Can't delete other library's messages with AllowAllMessageDeletion on

The display of messages "to the patron" on the checkout screen
lacked the same logic controlling messages "to other librarians,"
affecting conditions under which the [Delete] link would be shown.
This match makes the two categories consistent with each other:
A delete link will be shown if the logged in branch matches the
branch where the message was set OR if AllowAllMessageDeletion
is turned on.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>