fdo#46942: Fix a regression caused by List removal.

3236c2c3 accidentally removed the gallery
item count which was used to differentiate the gallery symbols from
normal ones.

cui/source/tabpages/tpline.cxx

@@ -277,6 +277,7 @@ void SvxLineTabPage::InitSymbols(MenuButton* pButton)
         rtl::OUString aEmptyStr;
         const rtl::OUString *pUIName = NULL;
         sal_uInt32 i = 0;
+        nNumMenuGalleryItems = aGrfNames.size();
         for(std::vector<rtl::OUString>::iterator it = aGrfNames.begin(); it != aGrfNames.end(); ++it, ++i)
         {
             pUIName = &(*it);