Textinput: Remove trailing comma from autogrow

Fixes jquery-archivegh-7171

Author: Gabriel Schulhof

js/widgets/forms/autogrow.js

@@ -32,7 +32,7 @@ define( [
 				"keyup": "_timeout",
 				"change": "_timeout",
 				"input": "_timeout",
-				"paste": "_timeout",
+				"paste": "_timeout"
 			});
 
 			// Attach to the various you-have-become-visible notifications that the