[mirotalksfu] - add whiteboard gridLine

public/views/Room.html

@@ -1192,6 +1192,7 @@ access to use this app.
                 </div>
                 <div id="whiteboardOptions" class="whiteboard-header-options">
                     <button id="whiteboardGhostButton" class="fas fa-circle-half-stroke"></button>
+                    <button id="whiteboardGridBtn" class="fas fa-table-cells-large hidden"></button>
                     <input id="wbBackgroundColorEl" class="whiteboardColorPicker" type="color" value="#000000" />
                     <input id="wbDrawingColorEl" class="whiteboardColorPicker" type="color" value="#FFFFFF" />
                     <button id="whiteboardPencilBtn" class="fas fa-pencil-alt"></button>