Prevent proposals from re-sorting on multi-paged lists

This may already be part of: https://github.com/decidim/decidim/pull/6761, I'm not entirely sure.

If there are many proposals or projects, a multi-page view is created. If random sortition of proposals or projects is enabled by default, the order of the proposals is randomized when accessing a new page and/or a detailed view of the proposal/project. This makes it extremely difficult to have an overview of all projects/proposals and this behavior was mentioned as being irritating when conducting user feedback.

Suggestion: The order of proposals/projects is randomized once when accessing the module or the participatory space. As long as the user is within the module or participatory space, the same order of proposals/projects is kept.

Decidim version 0.22