go consensus: shorten gas import

[pro-wh]

switch to more concise FromUint64

[codecov]

Codecov Report

Merging #2802 into master will decrease coverage by 0.30%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2802      +/-   ##
==========================================
- Coverage   61.89%   61.58%   -0.31%     
==========================================
  Files         386      386              
  Lines       37234    37234              
==========================================
- Hits        23046    22932     -114     
- Misses      11135    11262     +127     
+ Partials     3053     3040      -13     

Impacted Files	Coverage Δ
go/consensus/api/transaction/gas.go	60.00% <0.00%> (ø)
.../oasis-node/cmd/debug/txsource/workload/runtime.go	1.77% <0.00%> (-55.63%)	⬇️
...ompute/txnscheduler/algorithm/batching/batching.go	78.66% <0.00%> (-6.67%)	⬇️
go/consensus/api/grpc.go	59.30% <0.00%> (-4.66%)	⬇️
go/storage/metrics.go	81.52% <0.00%> (-3.27%)	⬇️
go/storage/mkvs/iterator.go	83.12% <0.00%> (-2.50%)	⬇️
go/runtime/transaction/transaction.go	74.69% <0.00%> (-2.41%)	⬇️
go/runtime/tagindexer/tagindexer.go	68.47% <0.00%> (-2.18%)	⬇️
go/storage/client/client.go	75.93% <0.00%> (-2.08%)	⬇️
go/worker/compute/txnscheduler/committee/node.go	62.34% <0.00%> (-1.86%)	⬇️
... and 17 more

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[pro-wh]

coverage is wrong. this line is hit