Set default params.readPaths
Set default params.readPaths

We added the new `params.readPaths` for the test config, however it doesn't have a default value set so we get a warning from nextflow.
chuan-wang/NGI-ChIPseq,ewels/NGI-ChIPseq,chuan-wang/NGI-ChIPseq,chuan-wang/NGI-ChIPseq,ewels/NGI-ChIPseq,chuan-wang/NGI-ChIPseq,ewels/NGI-ChIPseq,ewels/NGI-ChIPseq,ewels/NGI-ChIPseq