Fix: dt-init sorting as 1D array didn't get indexing correct

* The sort handler was expecting to deal with a 2D array, so we always
  dropped into the single column first sort condition.
* See thread 20811 for more information.

.datatables-commit-sync

@@ -1 +1 @@
-d9ae476f33e842c5ed90ffa87e4eb038165c3de9
+2503461a43a643bd0faf46d2fd78aa482a87c110

media/js/jquery.dataTables.js

@@ -4529,6 +4529,11 @@
 			return idx+1 >= asSorting.length ? 0 : idx+1;
 		};
 	
+		// Convert to 2D array if needed
+		if ( typeof sorting[0] === 'number' ) {
+			sorting = [ sorting ];
+		}
+	
 		// If appending the sort then we are multi-column sorting
 		if ( append && settings.oFeatures.bSortMulti ) {
 			// Are we already doing some kind of sort on this column?