Fix mouseup event handling when dragging a list record (#1490359)

This fixes drag-n-drop on managesieve filters list.

program/js/list.js

@@ -152,7 +152,12 @@ init_row: function(row)
 
     // set eventhandlers to table row (only left-button-clicks in mouseup)
     $(row).mousedown(function(e) { return self.drag_row(e, this.uid); })
-      .mouseup(function(e) { if (e.which == 1) return self.click_row(e, this.uid); });
+      .mouseup(function(e) {
+        if (e.which == 1 && !self.drag_active)
+          return self.click_row(e, this.uid);
+        else
+          return true;
+      });
 
     if (bw.touch && row.addEventListener) {
       row.addEventListener('touchstart', function(e) {