Fix: [Script] Apply random deviation only at script start (#11944)

src/game/game.hpp

@@ -31,8 +31,9 @@ public:
 
 	/**
 	 * Start up a new GameScript.
+	 * @param randomise Whether to randomise the configured GameScript.
 	 */
-	static void StartNew();
+	static void StartNew(bool randomise = true);
 
 	/**
 	 * Uninitialize the Game system.

src/game/game_core.cpp

@@ -69,7 +69,7 @@
 	}
 }
 
-/* static */ void Game::StartNew()
+/* static */ void Game::StartNew(bool randomise)
 {
 	if (Game::instance != nullptr) return;
 
@@ -83,6 +83,7 @@
 	GameInfo *info = config->GetInfo();
 	if (info == nullptr) return;
 
+	if (randomise) config->AddRandomDeviation();
 	config->AnchorUnchangeableSettings();
 
 	Backup<CompanyID> cur_company(_current_company, FILE_LINE);