Minor but correction in sigali output.

- Translation to z3z now evaluates constant expressions instead of
  abstracting them. This non-feature could cause "false" synthesis
  failures due to non-translatable yet constant expressions possibly
  introduced by tomato (or manually), for instance `not false' in node
  `n' bellow:

    node n (a: bool) returns (ok: bool)
      contract assume true enforce ok with ()
    let
      ok = a or not false;
    tel

compiler/minils/sigali/sigalimain.ml

@@ -61,7 +61,7 @@ let current_inputs : IdentSet.t ref = ref IdentSet.empty
 let current_locals : IdentSet.t ref = ref IdentSet.empty
 
 let translate_static_exp se =
-  match se.se_desc with
+  match (Static.simplify QualEnv.empty se).se_desc with
   | Sint(v) -> Cint(v)
   | Sfloat(_) -> raise Untranslatable
   | Sbool(true)