SBA to binaural_room rendering does not use custom BRIRs

When the reference renderer is used for rendering in the binaural_room configuration mode from scene-based audio, it does not make use of the custom binaural dataset option. Instead, it reverts to using the default dataset name specified in the code. These creates a run-time error when a custom dataset is used. This error is caused because relevant functions in the script scenebased.py are not programmed to pass the custom binaural database option to the functions that carry out the rendering.