chore(amino): improve error readability #753

Job	Run time
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	21s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	9s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	17s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	21s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	13s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	15s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	13s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	18s
test (1.20.x, _test.flappy)	53s
test (1.20.x, _test.pkg.amino)	3m 26s
test (1.20.x, _test.pkg.bft)	4m 34s
test (1.20.x, _test.pkg.others)	5m 1s
test (1.21.x, _test.flappy)	34s
test (1.21.x, _test.pkg.amino)	4m 0s
test (1.21.x, _test.pkg.bft)	4m 34s
test (1.21.x, _test.pkg.others)	6m 13s
	31m 22s

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