get rid of a memleak due to FireToClient not closing handles after firing

addons/sourcemod/scripting/nativevotes/game.sp

@@ -2368,6 +2368,8 @@ static void TF2CSGO_SendOptionsToClient(NativeVote vote, int client)
 	}
 	optionsEvent.SetInt("count", itemCount);
 	optionsEvent.FireToClient(client);
+	// FireToClient does not close the handle, so we call Cancel() to do that for us.
+	optionsEvent.Cancel();
 }
 
 static void CSGO_VotePass(const char[] translation, const char[] details, int team, int client=0)
@@ -3553,4 +3555,4 @@ stock bool Game_IsVoteTypeYesNo(NativeVotesType voteType)
 	}
 
 	return true;
-}
+}