Allow silent sound on older Android versions

app/src/main/java/eu/faircode/email/FragmentOptionsNotifications.java

@@ -311,7 +311,7 @@ public class FragmentOptionsNotifications extends FragmentBase implements Shared
                 intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_NOTIFICATION);
                 intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, getString(R.string.title_advanced_sound));
                 intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, true);
-                intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, false);
+                intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, true);
                 intent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, sound == null ? null : Uri.parse(sound));
                 startActivityForResult(Helper.getChooser(getContext(), intent), ActivitySetup.REQUEST_SOUND);
             }
@@ -333,7 +333,9 @@ public class FragmentOptionsNotifications extends FragmentBase implements Shared
         tvNoChannels.setVisibility(Build.VERSION.SDK_INT < Build.VERSION_CODES.O ? View.VISIBLE : View.GONE);
 
         grpChannel.setVisibility(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ? View.VISIBLE : View.GONE);
-        grpNotification.setVisibility(Build.VERSION.SDK_INT < Build.VERSION_CODES.O ? View.VISIBLE : View.GONE);
+        grpNotification.setVisibility(
+                Build.VERSION.SDK_INT < Build.VERSION_CODES.O || BuildConfig.DEBUG
+                        ? View.VISIBLE : View.GONE);
 
         PreferenceManager.getDefaultSharedPreferences(getContext()).registerOnSharedPreferenceChangeListener(this);