[mirotalksfu] - add button save participants info

public/views/Room.html

@@ -397,6 +397,7 @@ access to use this app.
             <header id="participantsHeader" class="participants-header">
                 <div class="participants-header-options">
                     <button id="participantsCloseBtn" class="fas fa-times"></button>
+                    <button id="participantsSaveBtn" class="hidden"><i class="fas fa-save"></i></button>
                 </div>
                 <div id="participantsTitle" class="participants-header-title"></div>
             </header>