message: [lang] Fix minor things in simple test case
diff: extern crate pdsl_lang;
  use pdsl_core::{
  - // storage, // Not in use since `contract!` currently generates no code.
  + storage,
  };
  contract! {
  @@ -25,7 +25,7 @@ contract! {
  }
  /// Returns the internal counter.
  - pub(external) fn get(&self) -> Balance {
  + pub(external) fn get(&self) -> u32 {
  *self.value
  }
  