Mobile: remember if we were able to open the local cache

If there is a local cache, we at least once successfully accessed the cloud, so
this is a valid cloud based git tree.

Without this change we run into a subtle bug: after a fresh install, or when
switching users, when the cloud data is accessed the very first time, we don't
remember that this was indeed loaded from the cloud. So if we then download
from a dive computer or make any other changes to the dive log, we cannot save
those dives to cloud storage - but we fail silently doing so. Which to the user
would look that inexplicable data loss.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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