Move this.turn to PetraBot

The `BaseAI` shouldn't make assumptions whether the AI runs every turn.

binaries/data/mods/public/simulation/ai/common-api/baseAI.js

@@ -6,9 +6,6 @@ export function BaseAI(settings)
 		return;
 
 	this.player = settings.player;
-
-	// played turn, in case you don't want the AI to play every turn.
-	this.turn = 0;
 }
 
 /** Return a simple object (using no classes etc) that will be serialized into saved games */

binaries/data/mods/public/simulation/ai/petra/_petrabot.js

@@ -9,6 +9,8 @@ export function PetraBot(settings)
 {
 	BaseAI.call(this, settings);
 
+	// played turn, because Petra doesn't play every turn.
+	this.turn = 0;
 	this.playedTurn = 0;
 	this.elapsedTime = 0;