fix typo. Now caps are correctly reset when a contact goes offline. Fixes #4181

src/common/caps.py

@@ -238,7 +238,7 @@ class ConnectionCaps(object):
 		if not caps:
 			contact.caps_node = None
 			contact.caps_hash = None
-			contact.hash_method = None
+			contact.caps_hash_method = None
 			return
 
 		hash_method, node, hash = caps['hash'], caps['node'], caps['ver']