Bug 15597: Typo in opac-auth-detail.tt

Bug 15597: Typo in opac-auth-detail.tt

Patch fix a small type

To test:
- Verify that a double punctuation mark colon (:) is fix it.

Signed-off-by: Briana <brianagreally@gmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit 386aafd8bda94581c4eaa070552bf9a025306ceb)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
(cherry picked from commit 6cb7dc0c0a06839892bcba9172a1603793481f90)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>