tag: disable tag module for category redirect pages

[NovemLinguae]

Requested by A smart kitten at https://en.wikipedia.org/wiki/Wikipedia_talk:Twinkle#Removal_of_rcat_tagging_menu_for_category_redirects

disable tag module for category redirect pages

Pages such as https://en.wikipedia.org/wiki/Category:Angus_and_Julia_Stone show the tag module for some reason. We should not place redirect tags on category redirects.

[NovemLinguae]

Noting for the record that https://en.wikipedia.org/wiki/Wikipedia:Redirect#Category_redirects says that on enwiki, for categories, we should always use {{Category redirect}} and not #REDIRECT.

Noting for the record that while I didn't notice this when I made the ticket, sometimes rcats are indeed placed in {{Category redirect}}s. Example:

{{Category redirect | Years of the 19th century in Ceylon | {{R from category navigation}} {{R from template-generated category}} }}

We may need to come back later and add this capability if it is common/useful. I think it is very uncommon though.