[prep/test] make wallet_fundrawtransaction's minrelaytxfee assumption explicit

Author: glozow

test/functional/wallet_fundrawtransaction.py

@@ -43,7 +43,8 @@ class RawTransactionsTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 4
         self.extra_args = [[
-            "-deprecatedrpc=settxfee"
+            "-deprecatedrpc=settxfee",
+            "-minrelaytxfee=0.00001000",
         ] for i in range(self.num_nodes)]
         self.setup_clean_chain = True
         # whitelist peers to speed up tx relay / mempool sync