Fix: icon invisible in Edge browser

[yfdyh000]

此补丁前，Edge的扩展管理和工具栏中该扩展始终呈现空白图标，似乎是Edge（及Chrome？）不能支持此svg图标。
Before applying this patch, the extension would always display a blank icon in Edge's extension management page and toolbar. It appears that Edge (and possibly Chrome as well) fails to render this SVG icon properly.

[eight04]

The SVG icon bug has been there for 17 years: https://issues.chromium.org/issues/41057033

Actually, you can get a usable icon by setting a custom color:

We render SVG in the background and send image to the toolbar.

If we want to fix it, we can simply set it as the default on chromium.

[yfdyh000]

If we want to fix it, we can simply set it as the default on chromium.

扩展管理界面需要一个图标。