Map presenter: ShowAsteroidsInMinimap stays (head's belt cost misses 0.1 ms); belt upload via SubUpdates; settings key restored

The setting gates belts on the minimap again, through MapPresenter.BeltsOnMinimap; the map screen always draws them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assets/Scripts/ServerShared/PlayerSettings.cs

@@ -63,7 +63,7 @@ public class PlayerGameplaySettings
 public class PlayerGraphicsSettings
 {
     [Key(0)] public Quality NebulaQuality = Quality.Normal;
-    // Key 1 is retired; an older player.cc that still carries it loads, and it is dropped.
+    [Key(1)] public bool ShowAsteroidsInMinimap;
     // How hard the camera shakes when the player's ship takes an impact: 0 off, 1 full (Feedback.Cue).
     [Key(2)] public float ScreenShake = 1f;
 }