Fixup wasn't called for last actor (off-by-1)

Fix EasyRPG#1514

src/game_actors.cpp

@@ -49,7 +49,7 @@ void Game_Actors::Fixup() {
 		}
 	}
 
-	for (size_t i = 1; i < data.size(); ++i) {
+	for (size_t i = 1; i <= data.size(); ++i) {
 		GetActor(i)->Fixup();
 	}
 }