S&D Knockdown mode scoring tweak

Medusa4vver

I'm sure most of you have had it happen to you where you'd knock someone down and before you get to finish them off they just rejoin the match like nothing happened and you don't get a kill count.

It gets a bit absurd sometimes when 3-4 people leave and rejoin in a single round and it's just wasted kills all the time.

So yeah I'm suggesting the knockdown to count as a kill if the groggy player leaves the match for whatever reason.