WWSympa: Add Autofocus support on some input forms

[ikedas]

Expected Behavior

On some screens it is useful to have auto-focus on the first field of input form.

Current Behavior

Since no such auto-focus is provided, the focus is usually on the top bar icon.

Possible Solution

It would be better to use auto-focus for the following fields. These would not conflict with accessibility guidelines.

• [ ] filter_list in web_tt2/search_list_request.tt2
• [ ] listname in web_tt2/create_list_request.tt2
• [ ] email in web_tt2/login.tt2
• [ ] email in web_tt2/renewpasswd.tt2

Context

This issue is the successor to the unfinished PRs #1647 & #1648 .