Revert "Use uncompressed FASTQ to confirm Galaxy regression"

This reverts commit 126e3e716965016808ec2ba3a4be3b1075a2ebbf.

The workaround is no longer needed thanks to this Galaxy fix:
https://bitbucket.org/galaxy/galaxy-central/commits/a74d32014b0512613042c2a44d0b946703a1fbcd