Fix: Column ordering state saving was being flatten

(commit d9ae476f33e842c5ed90ffa87e4eb038165c3de9)

Author: zmajstor

Diff for: app/assets/javascripts/dataTables/jquery.dataTables.js

@@ -4765,10 +4765,13 @@
 		oSettings._iDisplayStart    = oData.iStart;
 		oSettings.iInitDisplayStart = oData.iStart;
 		oSettings._iDisplayLength   = oData.iLength;
-		oSettings.aaSorting = $.map( oData.aaSorting, function ( col, i ) {
-			return col[0] >= columns.length ?
+    oSettings.aaSorting = [];
+    
+    $.each( oData.aaSorting, function ( i, col ) {
+      oSettings.aaSorting.push( col[0] >= columns.length ?
 				[ 0, col[1] ] :
-				col;
+				col
+      );
 		} );
 
 		/* Search filtering  */