BluetoothLeSensorPreference was not adhering to configured default value.

src/main/java/de/dennisguse/opentracks/settings/bluetooth/BluetoothLeSensorPreference.java

@@ -10,6 +10,7 @@ import android.bluetooth.le.ScanResult;
 import android.bluetooth.le.ScanSettings;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.content.res.TypedArray;
 import android.os.Bundle;
 import android.os.ParcelUuid;
 import android.text.TextUtils;
@@ -18,6 +19,7 @@ import android.util.Log;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
 import androidx.preference.DialogPreference;
 import androidx.preference.PreferenceDialogFragmentCompat;
@@ -80,6 +82,12 @@ public abstract class BluetoothLeSensorPreference extends DialogPreference {
         }
     }
 
+    @Nullable
+    @Override
+    protected Object onGetDefaultValue(@NonNull TypedArray a, int index) {
+        return a.getString(index);
+    }
+
     @Override
     protected void onSetInitialValue(Object defaultValue) {
         setValue(getPersistedString((String) defaultValue));