Minor fixes.

- reversed condition for simplified UI
- removed duplicate code

wled00/xml.cpp

@@ -406,7 +406,9 @@ void getSettingsJS(byte subPage, char* dest)
   {
     sappends('s',SET_F("DS"),serverDescription);
     sappend('c',SET_F("ST"),syncToggleReceive);
+  #ifdef WLED_ENABLE_SIMPLE_UI
     sappend('c',SET_F("SU"),simplifiedUI);
+  #endif
   }
 
   if (subPage == 4)