Fixed ZONE as primary_location

[falico]

The current fix for #35 forgot to also change the ZONE variable in scripts/validate.sh

[helmsman-bot]

Can one of the admins verify this patch?

[google-oss-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[falico]

@googlebot I signed it!

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[falico]

/assign @robinpercy

[geojaz]

/lgtm
thanks!