Apply suggestion from @graingert

Author: graingert

src/outcome/_impl.py

@@ -194,7 +194,7 @@ def __repr__(self) -> str:
         try:
             return f'Value({self.value!r})'
         except AttributeError:
-            return f'Value(<AlreadyDestroyed>)'
+            return 'Value(<AlreadyDestroyed>)'
 
     def unwrap(self) -> ValueT:
         self._set_unwrapped()