change default walltime for bowtie2 (23h->47h)
change default walltime for bowtie2 (23h->47h)

kundajelab/atac_dnase_pipelines,kundajelab/atac_dnase_pipelines,kundajelab/atac_dnase_pipelines,kundajelab/atac_dnase_pipelines,kundajelab/atac_dnase_pipelines