test: Return new_utxos from create_self_transfer_multi in MiniWallet

test/functional/feature_dbcrash.py

@@ -192,14 +192,12 @@ class ChainstateWriteCrashTest(BitcoinTestFramework):
                 # Sanity check -- if we chose inputs that are too small, skip
                 continue
 
-            tx = self.wallet.create_self_transfer_multi(
+            self.wallet.send_self_transfer_multi(
                 from_node=node,
                 utxos_to_spend=utxos_to_spend,
                 num_outputs=3,
-                fee_per_output=FEE // 3)
-
-            # Send the transaction to get into the mempool (skip fee-checks to run faster)
-            node.sendrawtransaction(hexstring=tx.serialize().hex(), maxfeerate=0)
+                fee_per_output=FEE // 3,
+            )
             num_transactions += 1
 
     def run_test(self):