co2_sensor: Reset SCD30 after startup

Sometimes after a hard reset of the ESP the SCD30
needs a long time until returning the first measurement.
Resetting it after startup seems to fix this behaviour.

ampel-firmware/co2_sensor.cpp

@@ -83,6 +83,10 @@ namespace sensor {
       ESP.restart();
     }
 
+    // Sometimes after a hard reset of the ESP the SCD30 needs
+    // a long time until returning the first measurement. Resetting it
+    // after startup seems to fix this behaviour.
+    scd30.reset();
     switchState(BOOTUP);
 
     Serial.print(F("Setting temperature offset to -"));