ksandbox: correct SRC_DIR path in build-images script

[gkapetanakis]

The script responsible for building the ksandbox images cds into the wrong path in the repo (experimental instead of experiment). This PR fixes that typo.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gkapetanakis
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