Raise explicitly an error (#6883)

Explicit is better than implicit

When calling raise without an argument, Python will raise the last error occured from the caller except block. This makes my PyCharm very sad however. So this PR makes the function handling the error raising explicitly the error received as an argument.

certbot/plugins/standalone.py

@@ -263,4 +263,4 @@ def _handle_perform_error(error):
         if not should_retry:
             raise errors.PluginError(msg)
     else:
-        raise
+        raise error