Fix server connection flow for protected and unprotected servers

[Trysha-rbrn]

• move join server prompt store access to the component scope
• open the password prompt correctly from the context menu for private servers

Fixes #356

[Trysha-rbrn]

fd81ab4

• unprotected servers now connect immediately from the in-game launcher
• this is fixed for both:
  • double-clicking a server in the list
  • using the Play button for the selected server

[itsneufox]

• move join server prompt store access to the component scope

• open the password prompt correctly from the context menu for private servers

Fixes #356

What if i want to set my username per server?

[Trysha-rbrn]

• move join server prompt store access to the component scope
• open the password prompt correctly from the context menu for private servers

Fixes #356

What if i want to set my username per server?

It still opens the full join prompt for protected servers, not just a password-only popup.

So the per-server username flow should still remain available there as well.