moat: support a comma-separated list of transports in Tor config

The enhancement we made for legacy/trac#29627 (moved) does not support a list of transports. This means that if the following is used, Tor Launcher will not detect that a PT that supports meek_lite is available:

ClientTransportPlugin meek_lite,obfs2,obfs3,obfs4,scramblesuit exec ./TorBrowser/Tor/PluggableTransports/obfs4proxy

Kathy and I will post a patch soon.

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