QL: fix visibility of module parameters

ql/ql/src/codeql_ql/ast/internal/Type.qll

@@ -387,7 +387,7 @@ private predicate defines(FileOrModule m, string name, Type t, boolean public) {
   exists(Module mod, SignatureExpr param, int i |
     m.asModule() = mod and
     mod.hasParameter(i, name, param) and
-    public = true
+    public = false
   |
     // resolve to the signature class
     t = param.asType().getResolvedType()