fix(handler): Remove handler include from sandbox (#834)

ui/StatusQ/sandbox/sandboxapp.h

@@ -8,8 +8,6 @@
 #include <QFileSystemWatcher>
 #endif
 
-#include "handler.h"
-
 class SandboxApp : public QGuiApplication
 {
 public:
@@ -22,7 +20,6 @@ public slots:
 
 private:
     QQmlApplicationEngine m_engine;
-    Handler *m_handler;
 
 #ifdef QT_DEBUG
     QFileSystemWatcher m_watcher;