strat: use atmosphere results instead of magics

stratosphere/ams_mitm/source/bpc_mitm/bpcmitm_reboot_manager.cpp

@@ -89,7 +89,7 @@ static void DoRebootToPayload() {
 Result BpcRebootManager::PerformReboot() {
     switch (g_reboot_type) {
         case BpcRebootType::Standard:
-            return RESULT_FORWARD_TO_SESSION;
+            return ResultAtmosphereMitmShouldForwardToSession;
         case BpcRebootType::ToRcm:
             RebootToRcm();
             return 0;