Upgrade StorageEmpty square icon for Mark Feed as Read
The context menus options for feeds show an empty square icon for Mark as Read:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/lzx860lb4mzj6hofazm0.png
https://s3.amazonaws.com/zotero.org/images/forums/u265723/nzz5skaa5g4zi6mzl9hu.png
Zotero 11.0-beta.1+b0db83d9d (64-bit)
Windows 11
https://s3.amazonaws.com/zotero.org/images/forums/u265723/lzx860lb4mzj6hofazm0.png
https://s3.amazonaws.com/zotero.org/images/forums/u265723/nzz5skaa5g4zi6mzl9hu.png
Zotero 11.0-beta.1+b0db83d9d (64-bit)
Windows 11