chmod spadmin script executable

Change-Id: I008be78b41a20924c1dabe291157ef9633282fe6
(cherry picked from commit a67f3f73248f998764bea46292118aa2c9886c11)
Reviewed-on: https://gerrit.libreoffice.org/8114
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>