test: Use generate* node RPC, not wallet RPC

test/functional/wallet_descriptor.py

@@ -84,7 +84,7 @@ class WalletDescriptorTest(BitcoinTestFramework):
         send_wrpc = self.nodes[0].get_wallet_rpc("desc1")
 
         # Generate some coins
-        self.generatetoaddress(send_wrpc, COINBASE_MATURITY + 1, send_wrpc.getnewaddress())
+        self.generatetoaddress(self.nodes[0], COINBASE_MATURITY + 1, send_wrpc.getnewaddress())
 
         # Make transactions
         self.log.info("Test sending and receiving")