more consistent use of parallel mode when enabled, takes care of example test from #1898 that didn't trigger parallel mode

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/tactic/smtlogics/qfuf_tactic.cpp

@@ -34,7 +34,7 @@ tactic * mk_qfuf_tactic(ast_manager & m, params_ref const & p) {
                     mk_solve_eqs_tactic(m, p),
                     using_params(mk_simplify_tactic(m, p), s2_p),
                     if_no_proofs(if_no_unsat_cores(mk_symmetry_reduce_tactic(m, p))),
-                    mk_smt_tactic(p));
+                    mk_smt_tactic(m, p));
 }