[otr-proxy] Fixed incorrect check of adaptee method existance (channel)

Authored by akulichalexandr on Sep 21 2016, 1:49 PM.

Description

[otr-proxy] Fixed incorrect check of adaptee method existance (channel)

The ChannelProxyInterfaceOTRAdaptor seems to be generated by outdated
qt-svc-gen.py from telepathy-qt.

The same fix applied at ccdf6a3c006a0f385a1224ee45f89a3776aa0fb9

Details