style: modernize go code

[thehowl]

as suggested by https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize

i'd avoid running this as a requirement, because this tool is still "unstable":

If the tool warns of conflicting fixes, you may need to run it more than once until it has applied all fixes cleanly. This command is not an officially supported interface and may change in the future.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 81.22867% with 55 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tm2/pkg/colors/colors.go	0.00%	13 Missing ⚠️
tm2/pkg/amino/amino.go	83.92%	9 Missing ⚠️
tm2/pkg/iavl/util.go	0.00%	6 Missing ⚠️
tm2/pkg/sdk/params/keeper.go	60.00%	4 Missing ⚠️
tm2/pkg/bft/abci/example/counter/counter.go	0.00%	3 Missing ⚠️
tm2/pkg/bft/types/evidence.go	25.00%	3 Missing ⚠️
tm2/pkg/errors/errors.go	75.00%	2 Missing ⚠️
gno.land/pkg/gnoclient/client_queries.go	50.00%	1 Missing ⚠️
gno.land/pkg/integration/testscript_testing.go	0.00%	1 Missing ⚠️
tm2/pkg/amino/deep_copy.go	80.00%	1 Missing ⚠️
... and 12 more

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