eval_old_dofs needs var, not var_component
eval_old_dofs needs var, not var_component

Hopefully this fixes the newer bug found in
https://github.com/idaholab/moose/issues/12309

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