Electrum 2.7.9-1 has no pre-configured proxy

Originally created by @anonym on #12140 (Redmine)

So it won’t connect unless the user clicks Tools -> Network -> Proxy -> SOCKS5 -> Ok. This is a regression against Tails 2.9.1 affecting Tails 2.10~rc1.

Feature Branch: bugfix/12140-electrum-proxy

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