Fix 508e465b: network servers didn't show invite-code / connection-type in Online Players GUI

[TrueBrain]

Motivation / Problem

Online Players window was no longer showing all that it should. Boo-boo of an earlier commit.

Description

The selector selects the first widget, which by accident was now only
the server visibility.

Limitations

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker