Fix #10486: [Script] Debug window requires AIs to be started before GS (#10487)

(cherry picked from commit 4072dcff49)

src/saveload/afterload.cpp

@@ -622,14 +622,16 @@ TileIndex GetOtherTunnelBridgeEndOld(TileIndex tile)
  */
 static void StartScripts()
 {
-	/* Start the GameScript. */
-	Game::StartNew();
+	/* Script debug window requires AIs to be started before trying to start GameScript. */
 
 	/* Start the AIs. */
 	for (const Company *c : Company::Iterate()) {
 		if (Company::IsValidAiID(c->index)) AI::StartNew(c->index, false);
 	}
 
+	/* Start the GameScript. */
+	Game::StartNew();
+
 	ShowScriptDebugWindowIfScriptError();
 }