ZenHub: Popup has scrollbars

[jonathansampson]

Describe the issue you encountered:
The ZenHub extension popup has unnecessary scrollbars.

Expected behavior:
There should not be any scrollbars on the popup.

Brave Version: 0.12.11

Screenshot if needed:

Any related issues: #5998, #6002

[jonathansampson]

The above is caused by the following CSS:

.zh-menu-header .zh-menu-items {
  position: absolute;
  right: -13;
  top: 8;
}

This causes the container housing the Dashboard, Help, and Sign Out links to be pushed 13 pixels over the right-edge of the viewport. This results in scrollbars.

Setting overflow-x: hidden on the html element resolves.