Fix ActionRowBuilder inner-type assertion (#912)

Author: FasterSpeeding

changes/912.bugfix.md

@@ -0,0 +1 @@
+Fix error message given by action row when a conflicted type is added.

hikari/impl/special_endpoints.py

@@ -1244,7 +1244,9 @@ def components(self) -> typing.Sequence[special_endpoints.ComponentBuilder]:
 
     def _assert_can_add_type(self, type_: messages.ComponentType, /) -> None:
         if self._stored_type is not None and self._stored_type != type_:
-            raise ValueError(f"{type_} component type cannot be added to a container which already holds {type_}")
+            raise ValueError(
+                f"{type_} component type cannot be added to a container which already holds {self._stored_type}"
+            )
 
         self._stored_type = type_