Fix http default backend test

[rikatz]

The default backend test is failing because we are passing space on the beginning of header and apparently go v1.21 blocks this now

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[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rikatz

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[rikatz]

/cherrypick release-1.8

[k8s-infra-cherrypick-robot]

@rikatz: #10382 failed to apply on top of branch "release-1.8":

Applying: Fix http default backend test
Using index info to reconstruct a base tree...
M	.github/workflows/ci.yaml
M	test/e2e/settings/ocsp/ocsp.go
Falling back to patching base and 3-way merge...
Auto-merging test/e2e/settings/ocsp/ocsp.go
Auto-merging .github/workflows/ci.yaml
CONFLICT (content): Merge conflict in .github/workflows/ci.yaml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Fix http default backend test
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-1.8

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.