vfb: allow to set any kind of resolution

Instead of limiting the size of the frame buffer, allow to allocate
a bigger frame buffer. This is useful if you have an initial one
that is small and you want to request on the fly a new one that
is bigger without the need to create a new server.
3 jobs for vfb-resolution in 8 minutes and 39 seconds (queued for 1 second)
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