Update src/textual/getters.py

Co-authored-by: TomJGooding <[email protected]>

Author: willmcgugan

src/textual/getters.py

@@ -181,6 +181,6 @@ def __get__(
             raise NoMatches(f"No child found with id={self.child_id!r}")
         if not isinstance(child, self.expect_type):
             raise WrongType(
-                f"Child with id={id!r} is the wrong type; expected type {self.expect_type.__name__!r}, found {child}"
+                f"Child with id={self.child_id!r} is the wrong type; expected type {self.expect_type.__name__!r}, found {child}"
             )
         return child