Disable image download for visitors

[PeopleInside]

Allow to disable image download button.
I cannot do even with a CSS as the div with the download button has no class.

Maybe images shared with the visitor has copyright and not all should be allowed to be downloaded, avoid the download button for images shared in the chat. If I want visitor download the image I can send as attachments.

Add an option to disable download button in the visitor image view.
#1902