message: fix defaultValue on getLocalSetting and getSyncedSetting
diff: @@ -139,7 +139,7 @@ module.exports = {
  getSyncedSetting: function(type, defaultValue = null) {
  const settings = this.getSyncedSettings();
  - return settings.hasOwnProperty(type) ? settings[type] : null;
  + return settings.hasOwnProperty(type) ? settings[type] : defaultValue;
  },
  setSyncedSetting: function(type, value) {
  @@ -156,7 +156,7 @@ module.exports = {
  getLocalSetting: function(type, defaultValue = null) {
  const settings = this.getLocalSettings();
  - return settings.hasOwnProperty(type) ? settings[type] : null;
  + return settings.hasOwnProperty(type) ? settings[type] : defaultValue;
  },
  setLocalSetting: function(type, value) {
  