remove old compability code

we aren't able to replay games from 1.2 anyway. (we aren't even able to replay games form 1.10)

src/playcampaign.cpp

@@ -189,13 +189,6 @@ LEVEL_RESULT play_replay(display& disp, game_state& gamestate, const config& gam
 {
 	const std::string campaign_type_str = lexical_cast<std::string> (gamestate.classification().campaign_type);
 
-	if (gamestate.replay_start().empty()){
-		// Backwards compatibility code for 1.2 and 1.2.1
-		const config &scenario = game_config.find_child(campaign_type_str,"id",gamestate.carryover_sides_start["next_scenario"]);
-		assert(scenario);
-		gamestate.replay_start() = scenario;
-	}
-
 	// 'starting_pos' will contain the position we start the game from.
 	const config& starting_pos = gamestate.replay_start();