go/oasis-node/cmd/stake: Use stake.shares flag in gen_reclaim_escrow tx

[tjanez]

Closes #2690.

[codecov]

Codecov Report

Merging #2738 into master will decrease coverage by 0.1%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master    #2738      +/-   ##
==========================================
- Coverage   63.08%   62.98%   -0.11%     
==========================================
  Files         383      383              
  Lines       36094    36097       +3     
==========================================
- Hits        22770    22734      -36     
- Misses      10501    10503       +2     
- Partials     2823     2860      +37

Impacted Files	Coverage Δ
go/oasis-node/cmd/stake/account.go	57.44% <81.81%> (+0.69%)	⬆️
go/worker/compute/executor/committee/state.go	74.07% <0%> (-11.12%)	⬇️
go/common/grpc/auth/auth.go	88.88% <0%> (-5.56%)	⬇️
go/worker/common/host/protocol/protocol.go	65.67% <0%> (-5.23%)	⬇️
go/consensus/api/grpc.go	59.3% <0%> (-4.66%)	⬇️
go/runtime/tagindexer/tagindexer.go	68.47% <0%> (-4.35%)	⬇️
go/worker/compute/executor/committee/node.go	62% <0%> (-3.75%)	⬇️
go/worker/common/p2p/p2p.go	67.56% <0%> (-3.61%)	⬇️
go/storage/client/client.go	76.47% <0%> (-2.53%)	⬇️
go/runtime/transaction/transaction.go	75.9% <0%> (-2.41%)	⬇️
... and 18 more

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[pro-wh]

ok