Remove indentation on last line of mutect2 wdl (#6077)
Remove indentation on last line of mutect2 wdl (#6077)

* Remove the one-space indentation of the last line to improve interpretation by some wdl processors. 

broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender