fix: remove updater if it is not used

launcher/ui/pages/global/LauncherPage.h

@@ -90,6 +90,7 @@ slots:
     void on_iconsDirBrowseBtn_clicked();
     void on_metadataDisableBtn_clicked();
 
+#ifdef LAUNCHER_WITH_UPDATER
     /*!
      * Updates the list of update channels in the combo box.
      */
@@ -100,13 +101,13 @@ slots:
      */
     void refreshUpdateChannelDesc();
 
+    void updateChannelSelectionChanged(int index);
+#endif
     /*!
      * Updates the font preview
      */
     void refreshFontPreview();
 
-    void updateChannelSelectionChanged(int index);
-
 private:
     Ui::LauncherPage *ui;