fdo#57950 Replace chained append in htmlatr.cxx
fdo#57950 Replace chained append in htmlatr.cxx

Change-Id: I121f437019d45f60017337dea091389ceb8334ce
Reviewed-on: https://gerrit.libreoffice.org/8661
Reviewed-by: Caolán McNamara <301f5784f9f6aac04077f24f1e5abc31af69d401@redhat.com>
Tested-by: Caolán McNamara <301f5784f9f6aac04077f24f1e5abc31af69d401@redhat.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core