message: Fix `clippy::redundant_slicing`
diff: @@ -262,7 +262,7 @@ impl EnvBackend for EnvInstance {
  V: scale::Encode,
  {
  let buffer = self.scoped_buffer().take_encoded(value);
  - ext::set_storage(key.as_ref(), &buffer[..]);
  + ext::set_storage(key.as_ref(), buffer);
  }
  fn get_contract_storage<R>(&mut self, key: &Key) -> Result<Option<R>>
  @@ -461,7 +461,7 @@ impl TypedEnvBackend for EnvInstance {
  T: Environment,
  {
  let buffer = self.scoped_buffer().take_encoded(&beneficiary);
  - ext::terminate(&buffer[..]);
  + ext::terminate(buffer);
  }
  fn transfer<T>(&mut self, destination: T::AccountId, value: T::Balance) -> Result<()>
  