Revert "Avoid numdiff check race condition in test"
Revert "Avoid numdiff check race condition in test"

This reverts commit 41d4678230e24635583eb892fdf473c5d6847a05.

sairajat/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii,naliboff/dealii,naliboff/dealii,sairajat/dealii,sairajat/dealii,sairajat/dealii,sairajat/dealii,naliboff/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii