test: always rescan after importing private keys in `init_wallet` helper

This fixes the functional test feature_rbf.py for descriptor wallets.

test/functional/test_framework/test_framework.py

@@ -431,7 +431,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
             n = self.nodes[node]
             if wallet_name is not None:
                 n.createwallet(wallet_name=wallet_name, descriptors=self.options.descriptors, load_on_startup=True)
-            n.importprivkey(privkey=n.get_deterministic_priv_key().key, label='coinbase')
+            n.importprivkey(privkey=n.get_deterministic_priv_key().key, label='coinbase', rescan=True)
 
     def run_test(self):
         """Tests must override this method to define test logic"""