test: Move feature_backwards_compatibility.py to wallet_backwards_compatibility.py

test/functional/test_framework/test_node.py

@@ -337,7 +337,7 @@ class TestNode():
             return
         self.log.debug("Stopping node")
         try:
-            # Do not use wait argument when testing older nodes, e.g. in feature_backwards_compatibility.py
+            # Do not use wait argument when testing older nodes, e.g. in wallet_backwards_compatibility.py
             if self.version_is_at_least(180000):
                 self.stop(wait=wait)
             else: