Those conditions that rely on AppSearch should only be checked when
not yet installed, since AppSearch is not performed in maintenance modes

Change-Id: Ie2c3fa8e8742a4c335f0cd8be571fa563a178a49
Reviewed-on: https://gerrit.libreoffice.org/52851Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>