Bug#804936: cantata: fix dependencies

[Stuart Prescott]

Control: severity -1 wishlist
Control: retitle -1 Please make a qt only version

The dependencies aren't incorrect and don't need fixing, they are just enabling 
different options. 

-- 
Stuart Prescott    http://www.nanonanonano.net/   stuart at nanonanonano.net
Debian Developer   http://www.debian.org/         stuart at debian.org
GPG fingerprint    90E2 D2C1 AD14 6A1B 7EBB 891D BBC1 7EBB 1396 F2F7