"Screen Keyboard" doesn't work in new Greeter

The same apply to the GNOME session in general but at least in the session we have Florence. Here this creates a false hope and should probably be removed for now.

Parent Task: #10828 (closed)

Related issues

Related to #10814 (closed)
Related to #16757 (closed)

Original created by @sajolida on 11430 (Redmine)

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