message: [tool][kimchi-visu] fix latex var name
diff: @@ -2050,7 +2050,7 @@ where
  Square(x) => format!("({})^2", x.latex(cache)),
  Cache(id, e) => {
  cache.insert(*id, e.as_ref().clone());
  - id.var_name()
  + id.latex_name()
  }
  }
  }
  