Set accessible names after the conditional block because text of m_pColLbl may be changed

Change-Id: I2902fd346384be2c9ffa471c71ad94cacede7d14
Reviewed-on: https://gerrit.libreoffice.org/26352Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>