remove obsolete template, fixes #4636

Closes #4636

Merge request studip/studip!3451

templates/sembrowse/extended-search.php

-<?= $search_obj->getFormStart(URLHelper::getLink('?send=yes'), ['class' => 'default']) ?>
-
-<fieldset>
-    <legend>
-        <?= _('Erweiterte Suche') ?>
-    </legend>
-
-    <label class="col-3">
-        <?= _('Titel') ?>
-        <?= $search_obj->getSearchField('title') ?>
-    </label>
-
-    <label class="col-3">
-        <?= _('Untertitel') ?>
-        <?= $search_obj->getSearchField('sub_title') ?>
-    </label>
-
-    <label class="col-3">
-        <?= _('Nummer') ?>
-        <?= $search_obj->getSearchField('number') ?>
-    </label>
-
-    <label class="col-3">
-        <?= _('Beschreibung') ?>
-        <?= $search_obj->getSearchField('comment') ?>
-    </label>
-
-    <label class="col-3">
-        <?= _('Lehrende') ?>
-        <?= $search_obj->getSearchField('lecturer') ?>
-    </label>
-
-    <? if ($show_class): ?>
-    <label class="col-3">
-        <?= _('Bereich') ?>
-        <?= $search_obj->getSearchField('scope') ?>
-    </label>
-    <? endif; ?>
-
-    <label class="col-2">
-        <?= _('Typ') ?>
-        <?= $search_obj->getSearchField('type') ?>
-    </label>
-
-    <label class="col-2">
-        <?= _('Verknüpfung') ?>
-        <?= $search_obj->getSearchField('combination') ?>
-    </label>
-
-    <div class="col-6" style="text-align:center; padding-top:20px;">
-        <?= $search_obj->getSearchButton([
-            'class' => 'search'
-            ]) ?>
-        <?= Studip\LinkButton::createCancel(
-            _('Zurücksetzen'),
-            URLHelper::getURL('?cmd=xts&reset_all=1&level='.$sem_browse_data['level']),
-            ['title' => _('Zurücksetzen')]
-            ) ?>
-    </div>
-</fieldset>
-<?= $search_obj->getFormEnd() ?>