small ui fixes

sys0-code/api/fetch_users.php

@@ -29,6 +29,8 @@ while ($row = $result->fetch_assoc()) {
     }
     if($row["class_id"]==0){
 	echo "<option value='0' selected>Lehrperson</option>";
+    }else{
+	echo "<option value='0'>Lehrperson</option>";
     }
     echo "</select>
     </td>";

sys0-code/app/manage_user.php

@@ -36,6 +36,7 @@ function load_user()
         <input type="text" class="form-control" name="username" placeholder="Benutzername eingeben">
         <button type="submit" class="btn btn-primary">Suchen</button>
     </form>
+    <div style="overflow-x: auto;">
     <table class="table mt-5" id="userTable" >
         <thead>
             <tr>
@@ -59,6 +60,7 @@ function load_user()
         <tbody></tbody>
     </table>
     </div>
+</div>
 
 <div id="footer">
 </div>