fdo#75898 SwFEShell::InsertRow: fix this in case bSelectAll == true

Change-Id: Iaf59db6a55c3f81d11d0196d5d3e52056e31c4b1
(cherry picked from commit f1f9b5b1b73218274ee69cf4e518c2ba926458af)
Reviewed-on: https://gerrit.libreoffice.org/8574
Reviewed-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>
Tested-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>