Revert "Issue #1885564 by Cottser, SebCorbin, joelpittet, drupalninja99, jenlampton, longwave, aboros, trevorkjorlien, socketwench, shanethehat, mbrett5062, rteijeiro: Convert theme_task_list to Twig template."

Wrong issue number; correcting...

This reverts commit 511d9f79bfac4914d24d3265d08a0c08da654f87.
Issue #2329505 by Cottser, SebCorbin, joelpittet, drupalninja99, jenlampton, longwave, aboros, trevorkjorlien, socketwench, shanethehat, mbrett5062, rteijeiro: Convert theme_task_list to Twig template.