prevent intermittent failure in wallet_fundrawtransaction test

(cherry picked from commit 58d86d8)

Author: Tom Trevethan

test/functional/wallet_fundrawtransaction.py

@@ -1192,8 +1192,7 @@ def test_external_inputs(self):
         funded_tx4 = ext_fund.fundrawtransaction(raw_tx, input_weights=[{"txid": ext_utxo["txid"], "vout": ext_utxo["vout"], "weight": high_input_weight}], fee_rate=10)
         input_add_weight = high_input_weight - (41 * 4)
         tx4_weight = ext_fund.decoderawtransaction(funded_tx4["hex"])["weight"] + input_add_weight
-        tx4_vsize = int(ceil(tx4_weight / 4))
-        tx4_vsize = 2769 # ELEMENTS: larger transaction
+        tx4_vsize = int(ceil(tx4_weight / 4))  + 2172 # ELEMENTS: larger transaction input weight for CT
         assert_fee_amount(funded_tx4["fee"], tx4_vsize, Decimal(0.0001))
 
         # Funding with weight at csuint boundaries should not cause problems