Hide "QR-code" button from config import menu for Android devices without camera

client/ui/controllers/settingsController.h

@@ -59,6 +59,8 @@ public slots:
     bool isScreenshotsEnabled();
     void toggleScreenshotsEnabled(bool enable);
 
+    bool isCameraPresent();
+
 signals:
     void primaryDnsChanged();
     void secondaryDnsChanged();