Network indicator is not shown if 'Switch Networks' is off

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Steps to reproduce

1. Turn on 'Switch Networks' in settings
2. Login in test or dev net
3. Turn off 'Switch Networks'
4. Logout

Actual result

Network indicator disappears
In a logged out state, I have an impression I am searching in mainnet

Expected result

Network indicator is not dependant on 'Switch Networks'

[slaweet]

I originally (#1103) thought it should work as it does, but Andrei is right that testnet/custom node should be displayed always. Only Mainnet should depend on the show-network-swicher setting.