Not to break the 'old' Android app, introduce a bool that can indicate
if we are using the LOK from the 'old' (LOK-via-JNI-based) or from the
'new' (loolwsd-based) app.

Change-Id: I38bd665cc1d5bc88018574171443ecabc46763df
Reviewed-on: https://gerrit.libreoffice.org/70678Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>