lib.Result.__repr__() Fix missing f-qualifier

__repr__() tries to format a variable in an f-string without "f". Fix that.
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/Result.py

@@ -46,7 +46,7 @@ class Result:
         else:
             ret = self.stdout_str[:20]
         if quote:
-            ret = '"{ret}"'
+            ret = f'"{ret}"'
         return ret
 
     def __repr__(self) -> str: