LayerSurface: handle focus when switching outputs

Currently if a layer surface is focused and the user focuses a different
output the layer surface remains focused. However, updating focus on
layer surface unmap only considers seats that have the layer surface's
output focused.

To fix this there are 3 approaches I see:

1. Unfocus all layer surfaces on the old output when switching output
focus, focus any layer surfaces on the new output.

2. Disallow switching output focus while a layer surface is focused.

3. Stop caring about output focus when determining which layer surface
should gain/lose focus.

I've taken the 3rd option here as it is significantly simpler to
implement and maintain but still feels reasonably intuitive.

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