test: add feature_rbf.py --descriptors to test_runner.py

Author: theStack

Diff for: test/functional/test_runner.py

@@ -217,7 +217,8 @@
     'rpc_getblockfilter.py',
     'rpc_invalidateblock.py',
     'feature_utxo_set_hash.py',
-    'feature_rbf.py',
+    'feature_rbf.py --legacy-wallet',
+    'feature_rbf.py --descriptors',
     'mempool_packages.py',
     'mempool_package_onemore.py',
     'rpc_createmultisig.py --legacy-wallet',