SvxRedlinTable::IsValidEntry/IsValidComment: reuse code
SvxRedlinTable::IsValidEntry/IsValidComment: reuse code

Change-Id: If2d54aeea160b64601c14624f2e00c5234fe4bc9
Reviewed-on: https://gerrit.libreoffice.org/5457
Reviewed-by: Michael Stahl <eef8671db506f9731c0438a7613853b6391ca841@redhat.com>
Tested-by: Michael Stahl <eef8671db506f9731c0438a7613853b6391ca841@redhat.com>

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