fdo#85594 show row and column insert and removal buttons and hiding others

Change-Id: I47b3c7400f350e2af9bf2c228f6e8c10dec7b352
Reviewed-on: https://gerrit.libreoffice.org/12329
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>