Remove obsolete redirection code

src/main/java/de/thm/arsnova/controller/WelcomeController.java

@@ -29,11 +29,8 @@ import org.springframework.web.servlet.ModelAndView;
 public class WelcomeController extends AbstractController {
 	@RequestMapping(value = "/", method = RequestMethod.GET)
 	public final ModelAndView home(final HttpServletRequest request) {
-		String referer = request.getHeader("referer");
 		String target = "index.html";
-		if (referer != null && referer.endsWith("dojo-index.html")) {
-			target = "dojo-index.html";
-		}
+
 		return new ModelAndView("redirect:/" + target);
 	}
 }