writerfilter: avoid manual realloc in StyleSheetTable
writerfilter: avoid manual realloc in StyleSheetTable

Change-Id: Iebfbeab422b7a0ef19981e146db0e7b7508e80c0
Reviewed-on: https://gerrit.libreoffice.org/15594
Reviewed-by: Miklos Vajna <16f13092e03e3d9e997de904d0f86cc803fb6ef7@collabora.co.uk>
Tested-by: Jenkins <5a4fe08359c7f97380e408c717ef42c86939cd86@libreoffice.org>

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