Znuny4OTRS-WikimediaDTL: Unbreak read-only customer ID

Just use the same code as the RW customer ID.

In a standard OTRS install, this is a link in RW and plain text in RO mode.
The package removes this link, but changed the structure and didn't update the RO section.

Bumps version of package.

Bug: 59950
Change-Id: I527aa0ea016cb859aa9e24afa1985f4fd0bc660b