duplicates: Do not report duplicates when only mb_albumid is duplicated #1000
Description
$ beet duplicates -F
/home/simon/Música/2 Unlimited/Get Ready/03 - The Magic Friend.mp3
/home/simon/Música/2 Unlimited/Get Ready/04 - Contrast.mp3
/home/simon/Música/2 Unlimited/Get Ready/05 - Desire.mp3
/home/simon/Música/2 Unlimited/Get Ready/06 - Pacific Walk.mp3
/home/simon/Música/2 Unlimited/Get Ready/07 - Workaholic.mp3
/home/simon/Música/2 Unlimited/Get Ready/08 - Rougher Than The Average.mp3
/home/simon/Música/2 Unlimited/Get Ready/09 - Delight.mp3
/home/simon/Música/2 Unlimited/Get Ready/10 - Eternally Yours.mp3
/home/simon/Música/2 Unlimited/Get Ready/11 - Twilight Zone (Rave Version Edit).mp3
/home/simon/Música/2 Unlimited/Get Ready/12 - Get Ready For This (Vocal Version).mp3
/home/simon/Música/2 Unlimited/Get Ready/13 - The Magic Friend (Instrumental).mp3
/home/simon/Música/2 Unlimited/Get Ready/14 - Workaholic (Instrumental).mp3
$ ll Música/2\ Unlimited/Get\ Ready/
total 83M
-rw-rw-r-- 1 simon simon 7,5M oct 10 16:00 03 - The Magic Friend.mp3
-rw-rw-r-- 1 simon simon 6,4M oct 10 16:00 04 - Contrast.mp3
-rw-rw-r-- 1 simon simon 7,9M oct 10 16:00 05 - Desire.mp3
-rw-rw-r-- 1 simon simon 5,7M oct 10 16:00 06 - Pacific Walk.mp3
-rw-rw-r-- 1 simon simon 7,2M oct 10 16:00 07 - Workaholic.mp3
-rw-rw-r-- 1 simon simon 7,6M oct 10 16:00 08 - Rougher Than The Average.mp3
-rw-rw-r-- 1 simon simon 6,5M oct 10 16:00 09 - Delight.mp3
-rw-rw-r-- 1 simon simon 7,6M oct 10 16:00 10 - Eternally Yours.mp3
-rw-rw-r-- 1 simon simon 7,1M oct 10 16:00 11 - Twilight Zone (Rave Version Edit).mp3
-rw-rw-r-- 1 simon simon 6,4M oct 10 16:00 12 - Get Ready For This (Vocal Version).mp3
-rw-rw-r-- 1 simon simon 5,9M oct 10 16:00 13 - The Magic Friend (Instrumental).mp3
-rw-rw-r-- 1 simon simon 7,2M oct 10 16:00 14 - Workaholic (Instrumental).mp3
-rw-rw-r-- 1 simon simon 30K oct 10 16:00 cover.jpg
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