Release 7.4.1: Removed USM configuration properties because non-default values provide no benefit

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The following server properties have been removed from usm.properties since non-default values provide no benefits:

com.openexchange.usm.session.sync.keep_last_sent_s tate_in_db
com.openexchange.usm.force_new_sync_key_on_empty_s ync

USM will now always behave as if the default settings for those properties were set.

The following server property has been removed from usm_json.properties since the client can not handle a non-default setting:

com.openexchange.usm.json.sync.fatal_uuid_errors

USM will now always behave as if the default setting for this property was set.