fix(getmore-killcursor): slaveOk shall not be included on these
fix(getmore-killcursor): slaveOk shall not be included on these

The slaveOk flag SHOULD not be set for all follow-up getMore and
killCursors commands. The cursor on the server keeps the original
slaveOk value first set on the find command.

mongodb-js/mongodb-core,mongodb-js/mongodb-core