fix table cells on content modules edit, fixes #4972

Closes #4972

Merge request studip/studip!3742

resources/vue/components/ContentmodulesEditTable.vue

@@ -98,6 +98,7 @@
         </draggable>
         <tbody>
             <tr v-for="module in inactiveModules" :key="module.id" :class="getModuleCSSClasses(module)" v-cloak>
+                <td v-if="filterCategory === null"></td>
                 <td>
                     <input
                         type="checkbox"