feat(plugin): remove deployedPieces from GameState's serialisation

Author: anarchuser

plugin/src/shared/sc/plugin2021/GameState.kt

@@ -33,7 +33,7 @@ class GameState @JvmOverloads constructor(
         it to PieceShape.values().toMutableSet()
     }.toMap()
 
-    @XStreamAsAttribute
+    @XStreamOmitField
     val deployedPieces: Map<Color, MutableList<Piece>> = Color.values().map {
         it to mutableListOf<Piece>()
     }.toMap()