redeem suggestion for beneficiary argument is not always effective

The redeem fucntion for `CompetitionSuggestion` takes a beneficiary argument that is ignored if the redeem function is called by someone that is not the original suggestor.

this means that the original suggestor cannot have any garantee that the reward arrives at the beneficiary of his choice - someone else could call redeem first...

Start by locating the CompetitionSuggestion redeem function and trace how its beneficiary argument is handled when a caller other than the original suggestor invokes it. Reproduce the call-order scenario described in the issue, then verify that the original suggestor's chosen beneficiary is preserved regardless of who calls redeem.

Written by the indexing model from the issue text.