补齐继承转换回归样本的明确现金付款日

crates/fidc-core/src/corporate_book.rs

@@ -782,6 +782,7 @@ mod tests {
     fn successor_without_frozen_instrument_metadata_is_not_an_implicit_new_security() {
         let mut action = conversion();
         action.share_cash = 1.;
+        action.payable_date = Some(date());
         action.share_bonus = 1.;
         let data = conversion_data(vec![action], false);
         let mut book = conversion_book();