tdf#121620 Opening Image tab of Bullets and Numbering dialog resets selection

regression from
	commit 39e6bae2
	loplugin:useuniqueptr in cui numpages

Change-Id: I77e16880d0590793545da38b7a3c8c5d2626d8f5
Reviewed-on: https://gerrit.libreoffice.org/64441
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

cui/source/tabpages/numpages.cxx

@@ -844,7 +844,7 @@ void  SvxBitmapPickTabPage::ActivatePage(const SfxItemSet& rSet)
     }
 
     if(!aGrfNames.empty() &&
-        (pActNum && (lcl_IsNumFmtSet(pActNum.get(), nActNumLvl) || bIsPreset)))
+        (pActNum && (!lcl_IsNumFmtSet(pActNum.get(), nActNumLvl) || bIsPreset)))
     {
         m_xExamplesVS->SelectItem(1);
         NumSelectHdl_Impl(m_xExamplesVS.get());