If ambient background is enabled and song doesn't have cover, last one is used

[otiskujawa]

Describe the bug
After changing music to one without cover, background stays the same
After clicking on cover, it also shows one from last song with cover

Amethyst Details (required):

• Desktop v1.9.14

To Reproduce (optional)
Steps to reproduce the behavior:
0. Enable ambient background

1. Play music with cover
2. Play music without cover
3. Look at background
4. Click cover

Expected behavior (optional)
Background should change back to normal