Remove reference to key_context record in dt_return call in riak_moss_wm_user.
Remove reference to key_context record in dt_return call in riak_moss_wm_user.

Fixes MOSS208

Remove an inappropriate reference to the key_context record in
forbidden function in the riak_moss_wm_user module.

sdebnath/riak_cs,sdebnath/riak_cs,dragonfax/riak_cs,yangchengjian/riak_cs,GabrielNicolasAvellaneda/riak_cs,dragonfax/riak_cs,GabrielNicolasAvellaneda/riak_cs,yangchengjian/riak_cs,dragonfax/riak_cs,basho/riak_cs_report,yangchengjian/riak_cs,laurenrother/riak_cs,GabrielNicolasAvellaneda/riak_cs,sdebnath/riak_cs,basho/riak_cs,laurenrother/riak_cs,basho/riak_cs,laurenrother/riak_cs,dragonfax/riak_cs,GabrielNicolasAvellaneda/riak_cs,yangchengjian/riak_cs,basho/riak_cs,basho/riak_cs,laurenrother/riak_cs,basho/riak_cs_lfs,sdebnath/riak_cs