Fix shutdown procedure in RedisSubscriber.blisten().
Fix shutdown procedure in RedisSubscriber.blisten().

(cherry picked from commit ecdf5150b3b541787e183a6d0de7c06dc3fec626)

etcimon/vibe.d,chalucha/vibe.d,gedaiu/vibe.d,Geod24/vibe.d,etcimon/vibe.d,rejectedsoftware/vibe.d,DBankov/vibe.d