media-player: Rework styling for media player

Closed Administrator requested to merge fix_media_player_style into main

Fix the styling for the media player and make it look the same in the notification drawer and on the lockscreen.

Turns the media player widget into a GtkListBoxRow and places it in a GtkListBox so that the styling is inherited from libhandy. This way the same style can also be applied to the notifications without having the css duplicated. Fixes: Fixes:

CC: @tobias.bernard

Edited by Administrator

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