[mirotalksfu] - add missing tooltips

public/views/Room.html

@@ -1457,7 +1457,9 @@ access to use this app.
                     <button id="pollSaveButton">
                         <i class="fas fa-floppy-disk"></i>
                     </button>
-                    <button id="pollCloseBtn" class="fas fa-times"></button>
+                    <button id="pollCloseBtn">
+                        <i class="fas fa-times"></i>
+                    </button>
                 </div>
             </div>
             <div id="pollForm" class="poll-creation">