Revert "Merge ifttt from https://github.com/xMasterX/all-the-plugins"

This reverts commit bffd73c30e1634e99541fd6bfabcd92c73db4577, reversing
changes made to 87cbfd4c7404beadde6a1d078134410ffc4b3db7.

ifttt/ifttt_virtual_button.c

@@ -220,7 +220,6 @@ void ifttt_virtual_button_app_free(VirtualButtonApp* app) {
     furi_record_close(RECORD_POWER);
     furi_record_close(RECORD_GUI);
 
-    furi_hal_serial_async_rx_stop(app->serial_handle);
     furi_hal_serial_deinit(app->serial_handle);
     furi_hal_serial_control_release(app->serial_handle);