Don't show Max Player slider if Min players == Max players

[nixxquality]

Summary

This PR modifies the Create Game modal to only show the Max players slider if it's meaningful.

Motivation & Context

One of my games, Quality Riichi Mahjong has a minimum players of 4 and a maximum players of 4.
When you get the Create Game popup for this game, you get a Max players slider where both the min and max is 4, and so it does not move.
I feel it's appropriate that if you've set up your project settings so that min and max players are the same, then you should always use that number as the player count.

Screenshots / Videos (if applicable)

Before:

s.box.-.2026-01-29.4-01-29.PM.mp4

After:

Other games remain unaffected:

Checklist

• Code follows existing style and conventions
• No unnecessary formatting or unrelated changes
• Public APIs are documented (if applicable)
• Unit tests added where applicable and all passing
• I’m okay with this PR being rejected or requested to change 🙂

[Copilot]

Pull request overview

This PR updates the Create Game modal so that the “Max Players” slider is only shown when the configured minimum and maximum player counts differ.

Changes:

• Wraps the “Max Players” slider in a conditional so it is only rendered when MinPlayers != MaxPlayers.
• Leaves all backing logic (Players, MaxPlayers, MinPlayers, cookie handling, and OnSave) unchanged.

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[Copilot]

Conditionally hiding the Max Players slider when MinPlayers == MaxPlayers solves the UI issue, but it doesn’t actually enforce that fixed player count in the data that gets saved and passed to CreateGameResults. If a user has an existing cookie from when MinPlayers and MaxPlayers differed, Output.MaxPlayers (and thus Players) can still hold an out-of-range value even though the slider is now hidden, which contradicts the intent of always using the fixed player count for these games. Consider explicitly forcing Players to MinPlayers when MinPlayers == MaxPlayers (e.g. on initialization and/or in OnSave) so that stale cookie values cannot override the package’s fixed player count.

[nixxquality]

This would be a separate change, since this can happen with regular use as well.

[nixxquality]

#9930