Fix: SMA HomeManager PowerMeter must announce new values

the SMA power meter implementation did not announce that it received a
new datum, such that the power meter data age was never reset. this made
the power meter values outdated and hence invalid, even though new
values were received and processed.

src/PowerMeterUdpSmaHomeManager.cpp

@@ -139,6 +139,7 @@ uint8_t* PowerMeterUdpSmaHomeManager::decodeGroup(uint8_t* offset, uint16_t grou
                 Soutput(kanal, index, art, tarif, "Leistung L2", _powerMeterL2, timestamp);
                 Soutput(kanal, index, art, tarif, "Leistung L3", _powerMeterL3, timestamp);
                 count = 0;
+                gotUpdate();
             }
 
             continue;