Call Bank::update_accounts_hash() before taking bank snapshot (#19765)

This is a bugfix.

When `load_frozen_forks()` called `snapshot_bank()`, the accounts hash
was not computed.  So then when a snapshot archive was eventually
created, its hash would be all 1s, which is clearly wrong.  The fix is
to update the bank's accounts hash before taking the bank snapshot.

validator/src/main.rs

@@ -2751,6 +2751,8 @@ pub fn main() {
         snapshot_version,
         maximum_full_snapshot_archives_to_retain,
         maximum_incremental_snapshot_archives_to_retain,
+        accounts_hash_use_index: validator_config.accounts_db_use_index_hash_calculation,
+        accounts_hash_debug_verify: validator_config.accounts_db_test_hash_calculation,
     });
 
     validator_config.accounts_hash_interval_slots =