tdf#90695: In function Wizard Array box cannot be unchecked

Just remove the disabling

Change-Id: Ia03591610ba1b60a66d9962169383c4ab85288ca
Reviewed-on: https://gerrit.libreoffice.org/19590Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

formula/source/ui/dlg/formula.cxx

@@ -1572,7 +1572,6 @@ bool FormulaDlg_Impl::CheckMatrix(OUString& aFormula)
     {
         aFormula = aFormula.copy( 1, aFormula.getLength()-2 );
         m_pBtnMatrix->Check( bMatrix );
-        m_pBtnMatrix->Disable();
     } // if ( bMatrix )
 
     m_pTabCtrl->SetCurPageId(TP_STRUCT);