rpc: Default rbf enabled

test/functional/rpc_psbt.py

@@ -452,7 +452,7 @@ class PSBTTest(BitcoinTestFramework):
 
         # Creator Tests
         for creator in creators:
-            created_tx = self.nodes[0].createpsbt(creator['inputs'], creator['outputs'])
+            created_tx = self.nodes[0].createpsbt(inputs=creator['inputs'], outputs=creator['outputs'], replaceable=False)
             assert_equal(created_tx, creator['result'])
 
         # Signer tests