Fix wrong variable name

Fix a wrong variable name that causes errors when a configuration file
was manually specified.

Author: qtc-de

qubes-keepass.py

@@ -443,7 +443,7 @@ def load(path: str = None) -> Config:
             Config
         '''
         if path is not None:
-            config_path = Path(path)
+            config_file = Path(path)
 
         else: