muc: save oldest timestamp

So far we saved the timestamp which also had the `from`.
But we need this only to find out whether it's MUC history.

For displaying we should use the oldest delay timestamp.

Also in
https://github.com/profanity-im/profanity/commit/61f66966ddfe8ebd8bae26dd7ff92d777004edda#diff-4926fd4577a336bd3eb240f8104a5c5bL837
a error was introduced.

Before we saved the timestamp in all cases. And only if timestamp AND
from was given we went into MUC history case.
Normal timestamp saving was not done anymore only if it also had a from
attribute.

Regards https://github.com/profanity-im/profanity/issues/1254

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