Explore page: Pagination of topics doesn't work

[davidsvantesson]

• Gitea version (or commit ref): 1.10.0 / 1.11.0+dev-285-g5a3af7992
• Can you reproduce the bug at https://try.gitea.io:
  • Yes https://try.gitea.io/explore/repos?q=test&topic=1
  • No
  • Not relevant

Description

The links for Next and Last doesn't include topic=1 from the address so the search query change when going to next page.

[davidsvantesson]

Currently, listing of topics is only supported on the main explore page, so it should only be one place to change.