message: Fix Table::copy signature
diff: @@ -143,6 +143,7 @@ impl Table {
  /// Returns an error if the range is out of bounds of either the source or
  /// destination tables.
  pub fn copy(
  + _store: &mut impl AsStoreMut,
  _dst_table: &Self,
  _dst_index: u32,
  _src_table: &Self,
  