gui: draw vip tag if a song needs vip privilege

[cosven]

[coveralls]

Pull Request Test Coverage Report for Build 7973647122

Details

• -18 of 30 (40.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 55.354%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
feeluown/gui/widgets/songs.py	3	21	14.29%
<!--	Total:	12	30	40.0%	-->

Totals
Change from base Build 7948632490:	-0.04%
Covered Lines:	9073
Relevant Lines:	16391

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💛 - Coveralls