Fix bug affecting downsampling of paired alignments.
Fix bug affecting downsampling of paired alignments.

NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,igvteam/igv.js,igvteam/igv.js,NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer