Recolour some UI elements to match the player's ink

TableturfBattleServer/Game.cs

@@ -135,6 +135,7 @@ public class Game {
 					2 => new(235, 180, 253),
 					_ => new(180, 253, 199),
 				};
+				this.Players[i].UIBaseColourIsSpecialColour = i != 1;
 			}
 
 			// Choose the stage.

TableturfBattleServer/Player.cs

@@ -14,6 +14,8 @@ public class Player {
 	public Colour SpecialColour { get; set; }
 	[JsonProperty("specialAccentColour")]
 	public Colour SpecialAccentColour { get; set; }
+	[JsonProperty("uiBaseColourIsSpecialColour")]
+	public bool UIBaseColourIsSpecialColour { get; set; }
 	[JsonProperty("specialPoints")]
 	public int SpecialPoints { get; set; }