加入新的自定义界面后，主界面右上角图标消失，切换主题按钮失效 #287
Description
- config.json如下：
"singlePage":["about","now"],
"iconlist":{"about":"M10.561 8.073a6.005 6.005 0 0 1 3.432 5.142.75.75 0 1 1-1.498.07 4.5 4.5 0 0 0-8.99 0 .75.75 0 0 1-1.498-.07 6.004 6.004 0 0 1 3.431-5.142 3.999 3.999 0 1 1 5.123 0ZM10.5 5a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z","now":"M2.75 1h10.5c.966 0 1.75.784 1.75 1.75v10.5A1.75 1.75 0 0 1 13.25 15H2.75A1.75 1.75 0 0 1 1 13.25V2.75C1 1.784 1.784 1 2.75 1ZM2.5 2.75v10.5c0 .138.112.25.25.25h10.5a.25.25 0 0 0 .25-.25V2.75a.25.25 0 0 0-.25-.25H2.75a.25.25 0 0 0-.25.25Zm9.28 3.53-4.5 4.5a.75.75 0 0 1-1.06 0l-2-2a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018l1.47 1.47 3.97-3.97a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042Z"},
新自定义界面为“now”，使用16px的github官方图标checkbox
- 后来尝试去掉about的自定义图标，无果
- 目前状态如下图：
