[Bug] "Remove icon" button doesn't work

[sudo-saif]

Bug Description

The button "Remove icon" doesn't work in case a cover image was added

How to Reproduce

1. Add a cover image
2. Add an icon
3. Try removing the icon by clicking on the icon then click "Remove icon"

Expected Behavior

Should work just like that "Remove icon" button appearing when no cover is added

Operating System

Windows 10

AppFlowy Version(s)

0.1.5

Screenshots

Additional Context

No response