Notebookbar: PriorityHBox working after reload

Change-Id: Iba1802f386131b37b7972a7f022f85fdcdaab6fe
Reviewed-on: https://gerrit.libreoffice.org/43363Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>

sfx2/source/notebookbar/PriorityHBox.cxx

@@ -113,7 +113,8 @@ public:
 
     virtual void Resize() override
     {
-        SetSizeFromParent();
+        if (!m_bInitialized && SfxViewFrame::Current())
+            Initialize();
 
         if (!m_bInitialized)
         {