conncheck: clear the retransmit flag when the stun list is empty
This patch ensures that the retransmit flag is more tightly in sync with the stun transaction list, by now clearing it when the list becomes empty. It makes the code a bit more readable by dropping some cases. In a couple of places, the retransmit flag was also used as a way to compare the priority of a pair and the priority of the selected pair.
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