Change sorting to "Last updated" on default Issues view
Description
As a GitLab.com user, I am typically interested in the latest (chronologically) updated issues on the issues view. Showing last created issues per defaults pretends to show updates, but dismisses the fact that there might be much more activity on existing issues.
Proposal
As a small feature proposal, I want to suggest to change the default sorting order on /issues
to "Last updated" (instead of "Last created").
This needs to be evaluated with issue triage people as this might change their flow.