preload_images: Fix unnecessary conversion (unconvert)

[tstromberg]

Fixes lint error:

hack/preload-images/preload_images.go:92:72: unnecessary conversion (unconvert)
	args := []string{"scp", "-o", "StrictHostKeyChecking=no", "-i", string(sshKey), 

[tstromberg]

/ok-to-test

[k8s-ci-robot]

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[medyagh]

@tstromberg I included that in the docker-env PR do u mind if we close this in favor of that ?

#6604

[codecov-io]

Codecov Report

Merging #6607 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6607   +/-   ##
=======================================
  Coverage   37.56%   37.56%           
=======================================
  Files         138      138           
  Lines        8779     8779           
=======================================
  Hits         3298     3298           
  Misses       5065     5065           
  Partials      416      416

[minikube-pr-bot]

All Times minikube: [ 92.069450 91.629293 94.725684]
All Times Minikube (PR 6607): [ 93.203225 93.458848 92.784941]

Average minikube: 92.808142
Average Minikube (PR 6607): 93.149005

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6607) |
+----------------------+-----------+--------------------+
| minikube v           |  0.213838 |           0.200640 |
| Creating kvm2        | 20.053581 |          20.239302 |
| Preparing Kubernetes | 49.529007 |          49.164674 |
| Pulling images       |           |                    |
| Launching Kubernetes | 20.641502 |          21.350475 |
| Waiting for cluster  |  0.396236 |           0.223368 |
+----------------------+-----------+--------------------+

[tstromberg]

@medyagh - It's easier to test the other PR's that are broken by this if this fix is it's own easily mergeable PR.

[medyagh]

@medyagh - It's easier to test the other PR's that are broken by this if this fix is it's own easily mergeable PR.

agree ! you are right