test: refactor: take use of create_block version parameter (or use default)

test/functional/feature_taproot.py

@@ -1267,7 +1267,6 @@ class TaprootTest(BitcoinTestFramework):
         extra_output_script = CScript([OP_CHECKSIG]*((MAX_BLOCK_SIGOPS_WEIGHT - sigops_weight) // WITNESS_SCALE_FACTOR))
 
         block = create_block(self.tip, create_coinbase(self.lastblockheight + 1, pubkey=cb_pubkey, extra_output_script=extra_output_script, fees=fees), self.lastblocktime + 1)
-        block.nVersion = 4
         for tx in txs:
             tx.rehash()
             block.vtx.append(tx)