remove redundant gofmt check

[xrstf]

golangci-lint already includes gofmt. If I break the formatting in the main.go:

$ hack/verify-gofmt.sh
!!! 'gofmt -s' needs to be run on the following files:
./main.go

$ hack/verify-golint.sh
main.go:20: File is not `gofmt`-ed with `-s` (gofmt)
"sigs.k8s.io/hydrophone/cmd"

Just running the gofmt check is marginally faster, but I would presume that anyone aware enough to actually run it, already has configured their editor appropriately to not need it. And those who don't get caught by the existing golint checker in the presubmit job. 😁

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[rjsadow]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rjsadow, xrstf

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