Fix bgsaveerr issue in psync wrong offset test (#11043)
The kill above is sometimes successful and sometimes already too late. The PING in pysnc wrong offset test got rejected by bgsaveerr because lastbgsave_status is C_ERR. In theory, using diskless can avoid PING being affected, because when the replica is dropped, we will kill the child with SIGUSR1, and this will not affect lastbgsave_status. Anyway, this kill is not particularly needed here, dropping the kill is the best one, since we do have the waitForBgsave, so just let it take care of the bgsave. No need for fast termination.
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