[mirotalksfu] - improve button UI

public/views/Room.html

@@ -592,14 +592,8 @@ access to use this app.
                                             </div>
                                         </td>
                                     </tr>
-                                    <tr>
-                                        <td>
-                                            <button class="btn btn-primary" id="applyAudioOptionsButton">
-                                                Apply options
-                                            </button>
-                                        </td>
-                                    </tr>
                                 </table>
+                                <button id="applyAudioOptionsButton">Apply options</button>
                             </div>
                         </div>
                         <div id="speakerSelectDiv">