erase_ch/2 should return ctags for just the erased channel, not all of them.

This was not noticed for a long time because the only use of those ctags
was to emit consumer_deleted events which were handled by the management
database, and it ignored invalid {channel, ctag} combinations.
However, it did end up doing more work - and closing n channels out
of m became O(nm) instead of just O(n). References #86.

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