tests: Use a default of supports_cli=True (instead of supports_cli=False)

test/functional/wallet_multiwallet.py

@@ -24,7 +24,6 @@ class MultiWalletTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
-        self.supports_cli = True
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()