Correctly calculate size of taylor hood element in mini file

applications/stokes_dg/stokes_dg.mini

@@ -16,7 +16,7 @@ floatingbytes = 8
 memperrank = {mbperrank} * 1048576 | eval
 vdofsperdir = {formcompiler.ufl_variants.v_degree} + 1 | eval
 pdofsperdir = {formcompiler.ufl_variants.p_degree} + 1 | eval
-celldofs = {vdofsperdir} ** {dim} + {pdofsperdir} ** {dim} | eval
+celldofs = {dim} * {vdofsperdir} ** {dim} + {pdofsperdir} ** {dim} | eval
 cellsperrank = {memperrank} / ({floatingbytes} * {celldofs}) | eval
 cellsperdir = {cellsperrank} ** (1/{dim}) | eval | toint
 firstdircells = {ranks} * {cellsperdir} | eval