tests: Mark functional tests not supporting bitcoin-cli (--usecli) as such

test/functional/rpc_preciousblock.py

@@ -36,6 +36,7 @@ class PreciousTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
+        self.supports_cli = False
 
     def setup_network(self):
         self.setup_nodes()