This re-enables the sidebars for LOK, which were
disabled to avoid overheads.

Also, fixes a regression where editing stopped
when loading a new view because the sidebar window
creation killed the edit view.

Revert "Avoid various desktop GUI elements when used from LibreOfficeKit"
This reverts commit c0b70ec3.

Change-Id: I06b06a990f05c06b1889fa89b698dff6f494e09c
Reviewed-on: https://gerrit.libreoffice.org/71165Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>