Posts with liquified rewards excluded from voting

With the newest iteration of the neverending tale "Services That Solely Exist To Get A Share Of The Reward Pool", the curangel upvote code was updated to prevent upvotes on posts that set a liquifying service as beneficiary.

While the existence of likwid has been unfortunate already, its use has been so small that having an own check for it didn't occur necessary. As "improved" on the concept by combining it with a vote buying mechanism, @curangel will step up early and work against these kind of schemes becoming the new normal.

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