timedef: remove redundancy in Catalan date_fmt definitions

This is already factored into the month names, resulting in an awkward
construction:

$ env LC_ALL=ca_ES.UTF-8 date
dimecres, 6 de de novembre de 2024, 21:21:18 CST

This would now render as:

$ env LC_ALL=ca_ES.UTF-8 date
dimecres, 6 de novembre de 2024, 21:22:41 CST

Reviewed by: bapt, royger
Sponsored by: Klara, Inc.

(cherry picked from commit a4b7367eb027a99b9eb48bf18951049434a9e189)