[FIX] Socks5 proxy is always enabled

Fixed a regression that was introduced with commit
36b49c5de05d51517f2c75225d439bdef2bc7bda 

The Socks5 proxy is enabled by default. As this has no impact on the
internal connection establishment the file transfer in the OPN/IPN uses
Smack directly and thus may use Socks5 although the user denied it.

Change-Id: Ica88e82aa52710e3bc0e9cc77df5a24cd5eecaca
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1296
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>