Fixed HWCLOCK_SYNC parameter removal

source/ubl-settings-datetime.c

@@ -58,6 +58,8 @@ void yon_save_parameters(main_window *widgets){
         yon_config_register(HWCLOCK_SYNC_parameter,HWCLOCK_SYNC_parameter_command,"localtime");
     } else if (hwclock_sync == 2) {
         yon_config_register(HWCLOCK_SYNC_parameter,HWCLOCK_SYNC_parameter_command,"utc");
+    } else {
+        yon_config_remove_by_key(HWCLOCK_SYNC_parameter);
     }
 
 }