Fix complex-enabled bug in unit test.
Fix complex-enabled bug in unit test.

Fixes one of the issues reported in #2071.

Note: our current CIVET complex testing is not running or compiling
the unit tests, so this slipped through the cracks. I have a different
PR in that will hopefully address the unit testing issue so this won't
happen again.

90jrong/libmesh,roystgnr/libmesh,roystgnr/libmesh,pbauman/libmesh,libMesh/libmesh,pbauman/libmesh,BalticPinguin/libmesh,90jrong/libmesh,libMesh/libmesh,capitalaslash/libmesh,90jrong/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,90jrong/libmesh,hrittich/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,hrittich/libmesh,capitalaslash/libmesh,hrittich/libmesh,hrittich/libmesh,capitalaslash/libmesh,roystgnr/libmesh,90jrong/libmesh,pbauman/libmesh,dschwen/libmesh,roystgnr/libmesh,jwpeterson/libmesh,90jrong/libmesh,roystgnr/libmesh,dschwen/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,dschwen/libmesh,libMesh/libmesh,hrittich/libmesh,libMesh/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,roystgnr/libmesh,roystgnr/libmesh,dschwen/libmesh,pbauman/libmesh,pbauman/libmesh,roystgnr/libmesh,hrittich/libmesh,90jrong/libmesh,pbauman/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,dschwen/libmesh,pbauman/libmesh,libMesh/libmesh,capitalaslash/libmesh,dschwen/libmesh,pbauman/libmesh,capitalaslash/libmesh,dschwen/libmesh,libMesh/libmesh,dschwen/libmesh,BalticPinguin/libmesh,hrittich/libmesh,90jrong/libmesh,hrittich/libmesh,90jrong/libmesh,libMesh/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,hrittich/libmesh,jwpeterson/libmesh,libMesh/libmesh,pbauman/libmesh,capitalaslash/libmesh