fix: vertical template template uses wrong var name

[ThatsMrTalbot]

No description provided.

[SgtCoDFish]

/lgtm
/approve

(Haven't looked into it much, can review a followup if needed)

[jetstack-bot]

@SgtCoDFish: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

/lgtm
/approve

(Haven't looked into it much, can review a followup if needed)

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[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: SgtCoDFish

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[SgtCoDFish]

(added labels manually, will raise PR to fix owners file!)