Apply same fix to "leech" as "marked".

"Leech" does not need to be displayed in the taglist as a tag, as it is
already listed as a special item further up the list.
Merge pull request #2 from sobjornstad/master

"leech" tag has the same problem "marked" did
Fix random experimantation.
Merge branch 'master' into flake
Merge branch 'flake' into python3
Merge branch 'python3' of github.com:ospalh/anki into python3