Switch to speaker view when only 2 people are in the call

[sbe-arg]

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Is your feature request related to a problem? Please describe.
When starting in grid mode with 2 people in the call the participants camera cuts top and bottom margins.
This makes it hard for non nextcloud users to know how to switch view.

This raises the question. if we can improve the switch user experience from grid to presenter and back outside the ... menu

Describe the solution you'd like
either default to presenter view when 2 people are in the call or relocate the presenter view <> grid view switch out of the ... menu into the actions bar.

This could be configured in the admin settings or per call.

Describe alternatives you've considered
I try to guide my external users by showing a screenshot of where they need to click to change views.

Additional context
I use nexxtcloud with my clients trough the booking system so most of new customers are not familiar with nextcloud UI