Reland "Always use AV1 specific bitrate limits when spatial layers are used."

This reverts commit 030c6ff43fe407f87ae329512ebb87604b253074.

Reason for revert: reland with fix

Original change's description:
> Revert "Always use AV1 specific bitrate limits when spatial layers are used."
>
> This reverts commit d2d165d47cc7a2aaa53596ad8055ddc30b76101b.
>
> Reason for revert: All the regressions!
>
> Original change's description:
> > Always use AV1 specific bitrate limits when spatial layers are used.
> >
> > Bug: b/295129711
> > Change-Id: I93569027bea34c43e2a3c4de0875e8bbddd5b64e
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319283
> > Reviewed-by: Michael Horowitz <mhoro@webrtc.org>
> > Commit-Queue: Philip Eliasson <philipel@webrtc.org>
> > Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
> > Cr-Commit-Position: refs/heads/main@{#40719}
>
> Bug: b/295129711
> Change-Id: I5776edbaba33e86eb10414062ef2b29510f40b8d
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319880
> Commit-Queue: Philip Eliasson <philipel@webrtc.org>
> Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#40730}

Bug: b/295129711
Change-Id: I5fe84184d3f3780fdc4e9c1d43c4989d333d44a7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319881
Reviewed-by: Michael Horowitz <mhoro@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40739}