Avoid JS errors after [29057].

See #24716.


git-svn-id: https://develop.svn.wordpress.org/trunk@29069 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/media-grid.js

@@ -244,7 +244,7 @@
 
 			// Create a new EditAttachment frame, passing along the library and the attachment model.
 			this.editAttachmentFrame = new media.view.Frame.EditAttachments({
-				router:  this.gridRouter,
+				gridRouter:  this.gridRouter,
 				library:     library,
 				model:       model
 			});