R1:524579fe64a6

Diffusion: fix missing mobile "Actions" from Manage Repo

Summary:
After this change, the page "/manage/" related to Diffusion
repositories has an "Actions" button for mobile users:

{F276113}

Before this change, that button was missing only from this
specific page, and so it was really difficult for them
(if not impossible) to edit repository's basic information:

{F276115}

Do not confuse the hamburger menu on the sidebar with this
"Actions". The hamburger contains queries like Active Repo,
All Repo…