Fix theme margins

Fix spacing that was changed due to the restructuring of foldable tool
panels.

rtgui/sensorxtrans.cc

@@ -25,8 +25,5 @@ const Glib::ustring SensorXTrans::TOOL_NAME = "sensorxtrans";
 SensorXTrans::SensorXTrans () : FoldableToolPanel(this, TOOL_NAME, M("TP_RAW_SENSOR_XTRANS_LABEL"))
 {
 
-    packBox = Gtk::manage (new ToolParamBlock ());
-    pack_start (*packBox);
-
     show_all ();
 }