🌱 Fix typo in forward etcd leadership error message

[dlipovetsky]

What this PR does / why we need it:
The error message refers to "leader," but should refer to "leader candidate."

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

/area control-plane

[chrischdi]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: c16300049736c35f290cbe2d85e57659e088a04e

[sbueringer]

Thx!

/approve

/cherry-pick release-1.10

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.10 in a new PR and assign it to you.

In response to this:

Thx!

/approve

/cherry-pick release-1.10

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #12059

In response to this:

Thx!

/approve

/cherry-pick release-1.10

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-sigs/prow repository.