Remove unneccessary `if` condition

ampel-firmware/co2_sensor.cpp

@@ -135,9 +135,7 @@ namespace sensor {
     last_co2 = co2;
     // We assume the sensor has acclimated to the environment if measurements
     // change less than a specified percentage of the current value.
-    if (co2 > 0 && (100 * delta / config::max_deviation_during_accl) < co2) {
-      return true;
-    } else return false;
+    return (co2 > 0 && (100 * delta / config::max_deviation_during_accl) < co2);
   }
 
   bool countStableMeasurements() {