made input config file valid XML by adding a global container tag

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/branches/irrlicht@3327 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/input/device_manager.cpp

@@ -183,6 +183,8 @@ void DeviceManager::serialize()
     }
     
     
+    configfile << "<input>\n\n";
+    
     for(unsigned int n=0; n<m_keyboard_amount; n++)
     {
         m_keyboards[n].serialize(configfile);
@@ -192,5 +194,7 @@ void DeviceManager::serialize()
         m_gamepads[n].serialize(configfile);
     }
     
+    configfile << "</input>\n";
+    
     configfile.close();    
 }