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backends/screen-cast-stream-src: Set correct stride when using dmabufs

Pascal Nowack requested to merge pnowack/mutter:fix-screencast-dmabuf-wrong-stride into main

Quoting the commit message here:

Currently, mutter hardcodes the stride of all recorded images in a
screencast to width * 4.
While this stride is valid for general memory buffers, it is not
necessarily valid for dmabuf buffers, as the driver may need a specific
alignment of the stride.
This can currently result into import failures, e.g. when using the AMD
driver.

To fix this issue, retrieve the actual dmabuf stride, when using dmabuf
screencasts, and set it as the stride value in the PipeWire buffer.

Fixes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1913
Fixes: https://gitlab.gnome.org/GNOME/gnome-remote-desktop/-/issues/101

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