[NF] Fix Expression.compare for arrays.

Belonging to [master]:
  - #2821
  - OpenModelica/OpenModelica-testsuite#1087

Author: perost

Compiler/NFFrontEnd/NFExpression.mo

@@ -491,7 +491,7 @@ public
           ARRAY(ty = ty, elements = expl) := exp2;
           comp := valueCompare(ty, exp1.ty);
         then
-          if comp then compareList(exp1.elements, expl) else comp;
+          if comp == 0 then compareList(exp1.elements, expl) else comp;
 
       case RANGE()
         algorithm