test: Require standard txs in regtest

test/functional/p2p_invalid_tx.py

@@ -25,6 +25,9 @@ from data import invalid_txs
 class InvalidTxRequestTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
+        self.extra_args = [[
+            "-acceptnonstdtxn=1",
+        ]]
         self.setup_clean_chain = True
 
     def bootstrap_p2p(self, *, num_connections=1):