Cleanup using AndroidStudio analyze.

src/main/java/de/dennisguse/opentracks/sensors/GainManager.java

@@ -20,9 +20,7 @@ public class GainManager implements SensorConnector {
 
     private final SensorManager.SensorDataChangedObserver listener;
 
-    private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = (sharedPreferences, key) -> {
-        connect();
-    };
+    private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = (sharedPreferences, key) -> connect();
 
     private Context context;
     private Handler handler;

src/main/java/de/dennisguse/opentracks/sensors/sensorData/Aggregator.java

@@ -55,7 +55,7 @@ public abstract class Aggregator<Input, Output> {
     /**
      * Reset long term aggregated values (more than derived from previous SensorData). e.g. overall distance.
      */
-    public void reset() {};
+    public void reset() {}
 
     /**
      * Is the data recent considering the current time.