[backends/hwcomposer] Do not manually cleanup our HwcomposerWindow

It looks like libhybris already deletes the window when we do
eglDestroySurface resulting in a double delete if we also delete it.

backends/hwcomposer/egl_hwcomposer_backend.cpp

@@ -42,7 +42,6 @@ EglHwcomposerBackend::EglHwcomposerBackend(HwcomposerBackend *backend)
 EglHwcomposerBackend::~EglHwcomposerBackend()
 {
     cleanup();
-    delete m_nativeSurface;
 }
 
 bool EglHwcomposerBackend::initializeEgl()