ref |> 点击查看评论按钮，页面顶部蒙层颜色过浅

http://192.168.1.3:8080/zentao/bug-view-19985.html

Signed-off-by: xugenyuan <xugenyuan@wondertek.com.cn>

@@ -34,6 +34,7 @@ export struct CommentListDialogView {
         height: this.maxHeight + 'px',
         preferType: SheetType.BOTTOM,
         showClose: false,
+        maskColor: "#50000000",
         dragBar: false,
         onDisappear: () => {
           this.showCommentList = false