Fixes treeview not listening for new settings

Change-Id: Ib8f97015ca6488a631a67ecc52787a25d2992aef
Reviewed-on: http://gerrit.dmdirc.com/1185
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>

src/com/dmdirc/addons/ui_swing/framemanager/tree/TreeFrameManager.java

@@ -141,6 +141,10 @@ public final class TreeFrameManager implements FrameManager,
 
                 IdentityManager.getGlobalConfig().addChangeListener("treeview",
                         TreeFrameManager.this);
+                IdentityManager.getGlobalConfig().addChangeListener("ui",
+                        "sortrootwindows", TreeFrameManager.this);
+                IdentityManager.getGlobalConfig().addChangeListener("ui",
+                        "sortchildwindows", TreeFrameManager.this);
                 IdentityManager.getGlobalConfig().addChangeListener("ui",
                         "backgroundcolour", TreeFrameManager.this);
                 IdentityManager.getGlobalConfig().addChangeListener("ui",