Fix CSE7766 Sensor invalid energy load steps prevention

fixes PR #5793 solution which can async (load overflow) forever until device restart

sonoff/xnrg_02_cse7766.ino

@@ -189,6 +189,7 @@ void CseEverySecond(void)
       }
       else {
         AddLog_P(LOG_LEVEL_DEBUG, PSTR("CSE: Load overflow"));
+        cf_pulses_last_time = CSE_PULSES_NOT_INITIALIZED;
       }
       EnergyUpdateToday();
     }