Move Help from Settings to TrackList (overflow menu).

Fixes #956.

src/main/java/de/dennisguse/opentracks/settings/MainSettingsFragment.java

@@ -49,11 +49,6 @@ public class MainSettingsFragment extends PreferenceFragmentCompat {
             ((SettingsActivity) getActivity()).openScreen(getString(R.string.settings_api_key));
             return true;
         });
-
-        findPreference(getString(R.string.settings_open_tracks_key)).setOnPreferenceClickListener(preference -> {
-            ((SettingsActivity) getActivity()).openScreen(getString(R.string.settings_open_tracks_key));
-            return true;
-        });
     }
 
     @Override

src/main/java/de/dennisguse/opentracks/settings/OpenTracksSettingsFragment.java

@@ -1,21 +0,0 @@
-package de.dennisguse.opentracks.settings;
-
-import android.os.Bundle;
-
-import androidx.preference.PreferenceFragmentCompat;
-
-import de.dennisguse.opentracks.R;
-
-public class OpenTracksSettingsFragment extends PreferenceFragmentCompat {
-
-    @Override
-    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
-        addPreferencesFromResource(R.xml.settings_open_tracks);
-    }
-
-    @Override
-    public void onStart() {
-        super.onStart();
-        ((SettingsActivity) getActivity()).getSupportActionBar().setTitle(R.string.settings_open_tracks_title);
-    }
-}

src/main/java/de/dennisguse/opentracks/settings/SettingsActivity.java

@@ -93,8 +93,6 @@ public class SettingsActivity extends AbstractActivity implements ChooseActivity
             fragment = new ImportExportSettingsFragment();
         } else if (key.equals(getString(R.string.settings_api_key))) {
             fragment = new PublicAPISettingsFragment();
-        } else if (key.equals(getString(R.string.settings_open_tracks_key))) {
-            fragment = new OpenTracksSettingsFragment();
         }
 
         return fragment;