This fixes a mobile usability issue in Odoo Sign where some pages could not be scrolled, preventing users from viewing or completing content. It also hides the template modification option on mobile because that editing flow depends on drag-and-drop, which is not supported there.

This PR fixes some issues introduced in
https://github.com/odoo/enterprise/pull/11656/commits/44e9244f381d1e8f60b41a2025152444e8fbe627#diff-9fc168193c1e7a9cc6f24af8e8e7bdb8R2