Revert to FEInterface::shape() calls taking ElemType.
Revert to FEInterface::shape() calls taking ElemType.

The same issue in which the sides incorrectly inherited the parent Elem's p_level() was happening here.

dschwen/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,libMesh/libmesh,roystgnr/libmesh,roystgnr/libmesh,jwpeterson/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,jwpeterson/libmesh,libMesh/libmesh,roystgnr/libmesh,jwpeterson/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,dschwen/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,libMesh/libmesh,roystgnr/libmesh,jwpeterson/libmesh,dschwen/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,libMesh/libmesh,libMesh/libmesh,BalticPinguin/libmesh,libMesh/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,roystgnr/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,dschwen/libmesh