fix html in module search view, fixes #3838

Closes #3838

Merge request studip/studip!3519

app/views/search/module/show.php

 <table class="mvv-modul-details">
+    <colgroup>
+        <col style="width: 30%">
+        <col style="width: 30%">
+        <col style="width: 40%">
+    </colgroup>
     <tr>
-        <th class="mvv-modul-details-head" width="30%"><?= $modul->code ?></td>
-        <th class="mvv-modul-details-head" width="30%"><?= $institut->name ?></td>
-        <th class="mvv-modul-details-head" width="40%"><?= sprintf("%d CP", $modul->kp) ?> </td>
+        <th class="mvv-modul-details-head"><?= $modul->code ?></th>
+        <th class="mvv-modul-details-head"><?= $institut->name ?></th>
+        <th class="mvv-modul-details-head"><?= sprintf("%d CP", $modul->kp) ?> </th>
     </tr>
     <tr>
         <td colspan="2">