Disable dependency on just removed www/trac-ctxtnavadd to unbreak INDEX.
I overlooked this consumers in a first place, but they should be marked
deprecated too, because:
- www/trac-wikirename deprecated upstream (merged into trac 0.12) 
- www/trac-wikitemplates do not supposed to work with trac >10 according to 
Now I waiting for Greg's approval to deprecate them.
Approved by: glarkin (maintainer, implicit)