Editing an issue with mobile layout leads to a 404

Description

Background

In 10.1, we removed the standalone edit route and form: https://gitlab.com/gitlab-org/gitlab-ce/issues/36670

However, on mobile (or when your browser is narrow enough), we didn't use the inline editor, but that form instead.

We either need to bring that form back or use inline edit on mobile.

Issue_edit

Edited by Victor Wu