fixed typo that caused incorrect if there was only one book

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10022 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/helpfrm.cpp

@@ -773,8 +773,10 @@ void wxHtmlHelpFrame::CreateContents()
             if (booksCnt == 1)
             {
                 roots[0] = roots[1] = m_ContentsBox->AddRoot(
-                                         it->m_Name, IMG_Page, -1,
+                                         it->m_Name, IMG_Book, -1,
                                          new wxHtmlHelpTreeItemData(i));
+                imaged[0] = imaged[1] = TRUE;
+                m_ContentsBox->SetItemBold(roots[1], TRUE);
             }
             // multiple books:
             else