Change View callback order to (self, interaction, item)

This is more consistent with the rest of the library which always has
the interaction as the first parameter. This has been done before in
the command extension as well, the first parameter is always either
self or the context.

discord/ui/item.py

@@ -41,7 +41,7 @@ if TYPE_CHECKING:
 
 I = TypeVar('I', bound='Item')
 V = TypeVar('V', bound='View', covariant=True)
-ItemCallbackType = Callable[[V, I, Interaction], Coroutine[Any, Any, Any]]
+ItemCallbackType = Callable[[V, Interaction, I], Coroutine[Any, Any, Any]]
 
 
 class Item(Generic[V]):