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Properly set skip_deleted and threading on Kolab storage IMAP operations (T1145)

Description

Properly set skip_deleted and threading on Kolab storage IMAP operations (T1145)

Summary:
Fixes race-conditions between Kolab folders and Roundcube core
where skip_deleted/threading could be set for operations outside
of Kolab plugins, causing e.g. inability to see \Deleted messages.

Fixes T1145.

Reviewers: Roundcube Kolab Plugins Developers, vanmeeuwen

Reviewed By: Roundcube Kolab Plugins Developers, vanmeeuwen

Maniphest Tasks: T1145

Differential Revision: https://git.kolab.org/D112