When simulcast screenshare is enabled, the max bitrate for the high
quality stream can be limited based on the resolution.
This CL fixes a bug where that limit could get so low that it is below
the min bitrate of the top layer, which in turn could cause the encoder
to fail initialization.
Bug: webrtc:9761
Change-Id: I093bd0ba68fe0165e8982d169daf02cdf912c924
Reviewed-on: https://webrtc-review.googlesource.com/100682
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24767}
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