Bug 12379: remove double use of plugin KohaDates

The file catalog/detail.tt uses twice the plugin KohaDates, one can be removed

test plan: verify there is no regression about the dates on the biblio detail page

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
No problem with dates, no errors.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
No regressions found. Congratulations on your first patch Yohann!

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>