macosx: Fix displaying of album artwork when using detached video windows

Includes some changes to the detached audio window to make it look in line with the audio media view when using the embedded video view (even though we are using the detached audio window for this fix)

After fix:

Screen_Recording_2024-07-14_at_01.33.53

Before fix:

Screen_Recording_2024-07-14_at_01.42.34

Signed-off-by: Claudio Cambra developer@claudiocambra.com