fix(cmd/gno/clean): allow to run `gno clean -modcache` from anywhere … #9

Job	Run time
setup	9s
Run Main (gnodev) / Go Linter / lint	1m 9s
Run Main (gnodev) / Go Build / generated	6s
Run Main (gnodev) / Go Test / test	54s
Run Main (gnofaucet) / Go Build / generated	6s
Run Main (gnofaucet) / Go Linter / lint	29s
Run Main (gnofaucet) / Go Test / test	28s
Run Main (gnogenesis) / Go Build / generated	6s
Run Main (gnogenesis) / Go Linter / lint	31s
Run Main (gnogenesis) / Go Test / test	34s
Run Main (gnokeykc) / Go Build / generated	13s
Run Main (gnokeykc) / Go Linter / lint	30s
Run Main (gnokeykc) / Go Test / test	29s
Run Main (gnomd) / Go Build / generated	14s
Run Main (gnomd) / Go Linter / lint	23s
Run Main (gnomd) / Go Test / test	24s
Run Main (gnomigrate) / Go Build / generated	26s
Run Main (gnomigrate) / Go Linter / lint	43s
Run Main (gnomigrate) / Go Test / test	23s
	8m 17s

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