worker/registration: fix waiting for deregister event

[ptrus]

Added the resuming on closed stopRegCh to one place too many in 29dbfa8

TODO:

• update e2e tests to ensure the node is deregistered after request shutdown

[codecov]

Codecov Report

Merging #4662 (9e0c570) into master (a851f30) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4662      +/-   ##
==========================================
+ Coverage   66.97%   67.07%   +0.10%     
==========================================
  Files         431      431              
  Lines       48883    48884       +1     
==========================================
+ Hits        32737    32790      +53     
+ Misses      12107    12071      -36     
+ Partials     4039     4023      -16     

Impacted Files	Coverage Δ
go/worker/registration/worker.go	67.75% <ø> (-0.10%)	⬇️
go/oasis-node/cmd/common/genesis/staking.go	69.86% <100.00%> (+1.29%)	⬆️
...onsensus/tendermint/apps/beacon/state/state_vrf.go	73.33% <0.00%> (-13.34%)	⬇️
go/worker/common/committee/runtime_host.go	58.33% <0.00%> (-8.34%)	⬇️
go/runtime/host/sandbox/sandbox.go	59.15% <0.00%> (-6.70%)	⬇️
go/worker/common/p2p/dispatch.go	71.52% <0.00%> (-5.56%)	⬇️
go/worker/beacon/tx_retry.go	90.47% <0.00%> (-4.77%)	⬇️
go/consensus/api/submission.go	64.28% <0.00%> (-4.77%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	66.66% <0.00%> (-3.12%)	⬇️
go/worker/keymanager/p2p/client.go	80.95% <0.00%> (-2.39%)	⬇️
... and 35 more

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