macosx: use black color for detached window background
This avoids grey or transparent flashes on start (backport of 568303d7e84c1cb8a66ad694ea82e5fc7b2f4d43)
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This avoids grey or transparent flashes on start (backport of 568303d7e84c1cb8a66ad694ea82e5fc7b2f4d43)