Fixes https://github.com/rails/rails/issues/50853

The video analyzer was relying on the positional reference of the Display
Matrix side_data to fetch the rotation value. However, the side_data is
not guaranteed to be in the same position. For instance, HDR videos shot
on iOS have "DOVI configuration record" side_data in the first position,
followed by the "Display Matrix" side data containing the rotation value.

This fix removes the positional reference and explicitely searches for
the "Display Matrix" side_data to retrieve the rotation angle.