Item creation: fix the cancel button.

It wasn't working because the callback was not connected, but the
onDelete callback was connected instead (which shouldn't have been).

src/Pim/index.tsx

@@ -115,7 +115,7 @@ const CollectionRoutes = withRouter(
                 <ComponentEdit
                   collections={props.collections}
                   onSave={props.onItemSave}
-                  onDelete={props.onItemDelete}
+                  onCancel={props.onItemCancel}
                 />
               </Container>
             )}