tdf#103228: Remember fill type when switching between tabs

This page used not to have exchange support, but it needs it now
since it contains all the fill type subtabs

Change-Id: Ibeefc0ae832b4d53727711a169f1765d28350ec1
Reviewed-on: https://gerrit.libreoffice.org/30843Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

cui/source/tabpages/tparea.cxx

@@ -124,6 +124,8 @@ SvxAreaTabPage::SvxAreaTabPage( vcl::Window* pParent, const SfxItemSet& rInAttrs
     m_pBtnBitmap->SetClickHdl(aLink);
     m_pBtnPattern->SetClickHdl(aLink);
 
+    SetExchangeSupport();
+
     m_pFillTab->set_width_request(750);
     m_pFillTab->set_height_request(550);
 }