Fix bug #3051174 (reported by Trent Gamblin): Loading two or more times gui.xml file.

src/commands/cmd_configure_screen.cpp

@@ -203,6 +203,9 @@ void ConfigureScreen::load_resolutions(ComboBox* resolution, ComboBox* color_dep
 
       xmlElement = xmlElement->NextSiblingElement();
     }
+
+    // We just load the first gui.xml found
+    break;
   }
 
   // Current screen size

src/tools/toolbox.cpp

@@ -174,6 +174,9 @@ void ToolBox::loadTools()
       m_groups.push_back(tool_group);
       xmlGroup = xmlGroup->NextSiblingElement();
     }
+
+    // We just load the first gui.xml found
+    break;
   }
 }