Fix bugs with URL overrides in Connect window

[astorije]

Follow-up of 94f1d8d and probably another commit.

💥 3 bug fixes for the price of 1! 💥

1. Disallow URL override of network-related fields on the client when the network is locked

Before	After

2. Pass network name along to the client connect window when network is locked and not displayed

Before	After

3. Make sure the network name cannot be changed through URL override when the network info is not displayed

Before	After

[xPaw]

I believe this is not enforced on the server.

Setting displayNetwork to false, automatically sets lockNetwork to true. But neither of these options enforce the lock on name.

[astorije]

Mmmh, indeed. Anything (simple if possible) I need to add to this PR? Or for later?
It's plain weird that we can change the name on the title from the URL when not displayed (and a regression) but I see what you're saying.

[xPaw]

Hm. I think this if you added isn't even needed because you shouldn't have added name on the server in getClientConfiguration.

Server defaults to defaults.name if none provided here and displayNetwork is false: https://github.com/thelounge/thelounge/blob/master/src/client.js#L204

Technically it's still possible to directly send a name by modifying the form in devtools, but overriding the URL shouldn't work?

EDIT: Damn it, you added it because it's displayed.