Before this commit, the "rank by" parameter was deleted when a visitor
added a search criteria. This commit solves this problem.

Steps to reproduce the issue:
- Go to "/profile/users"
- Click on "Rank by" and select "This week"
- Search for a user (e.g. "admin")

=> The "rank by" parameter is lost and if you click on "This week"
again, the search (admin) will be lost.

task-3058239

closes odoo/odoo#113979

X-original-commit: https://github.com/odoo/odoo/commit/64f525eaa4f5e1bcd6999e0ef1335370918419fd


Signed-off-by: Benoit Socias (bso) <bso@odoo.com>