Removed GDK_BACKEND environment variable

source/ubl-settings-manager.c

@@ -230,7 +230,6 @@ main_window *yon_main_window_setup(){
 }
 
 int main(int argc, char *argv[]){
-    g_setenv("GDK_BACKEND","x11",1);
     setlocale(LC_ALL, "");
     textdomain (LocaleName);
     yon_ubl_connect_config((_template_config*)&main_config);