[FIXED JENKINS-17290] - Corrected sort order of tables

---------
It seems that the sort is for sorting ascending order, thus a
"descending" order should be sorter.reverse (+1 squashed commit)
Squashed commits:
[a5eb304] [FIXED JENKINS-17290]

war/src/main/webapp/scripts/sortable.js

@@ -178,7 +178,7 @@ var Sortable = (function() {
             var dir = this.pref.direction;
 
             var s = this.getSorter(column);
-            if(dir === arrowTable.up) {// ascending
+            if(dir === arrowTable.down) {// only need to reverse when it's descending
                 s = sorter.reverse(s);
             }