Fix duplicate id

src/Packagist/WebBundle/Resources/views/layout.html.twig

@@ -93,7 +93,7 @@
 
                                             <div class="signin-box-buttons">
                                                 <a href="{{ hwi_oauth_login_url('github') }}" class="pull-right btn btn-primary btn-github"><span class="icon-github"></span>Use Github</a>
-                                                <button type="submit" class="btn btn-success" id="_submit" name="_submit">{{ 'security.login.submit'|trans({}, 'FOSUserBundle') }}</button>
+                                                <button type="submit" class="btn btn-success" id="_submit_mini" name="_submit">{{ 'security.login.submit'|trans({}, 'FOSUserBundle') }}</button>
                                             </div>
                                         </form>