Revert "Submarine themes GTK3: cleanup gnome-midi.css"

This reverts commit 1f9fa5b9076c2c388425552c9c8d07ecf0fad828.
Revert "Submarine themes GTK3: adjust csd applications"

This reverts commit ee2958f366e0e6ed43feadff9b3cfbbb1f0b60a9.
Submarine themes GTK3: adjust csd applications