fix(kafka-pubsub): restore `pb.state` appropriately (#11135) #185

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	27m 4s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	25m 55s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	23m 12s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	23m 55s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	25m 50s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	25m 27s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	23m 48s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	23m 59s
	3h 19m 10s

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