[mirotalksfu] - fix icon

public/views/Room.html

@@ -424,7 +424,17 @@ access to use this app.
                     <button id="whiteboardTextBtn" class="fas fa-spell-check"></button>
                     <button id="whiteboardLineBtn" class="fas fa-slash"></button>
                     <button id="whiteboardRectBtn" class="far fa-square"></button>
-                    <button id="whiteboardTriangleBtn" class="fas fa-triangle-exclamation"></button>
+                    <button id="whiteboardTriangleBtn" class="fas">
+                        <svg
+                            xmlns="http://www.w3.org/2000/svg"
+                            width="1em"
+                            height="1em"
+                            viewBox="0 0 24 24"
+                            fill="#FFFFFF"
+                        >
+                            <path d="M12 5.887l8.468 14.113h-16.936l8.468-14.113zm0-3.887l-12 20h24l-12-20z" />
+                        </svg>
+                    </button>
                     <button id="whiteboardCircleBtn" class="far fa-circle"></button>
                     <button id="whiteboardSaveBtn" class="fas fa-save"></button>
                     <button id="whiteboardEraserBtn" class="fas fa-eraser"></button>