Actually remove DEAL_II_EXPLICIT_CONSTRUCTOR_BUG.
Actually remove DEAL_II_EXPLICIT_CONSTRUCTOR_BUG.

Follow-up to ac33ee15e72.

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