Rename metapatch var in applyAllocationToGameServer

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Minor fix from a PR comment that I had in the backlog but hadn't submitted yet.

Which issue(s) this PR fixes:

Fix for #2148 (comment)

Special notes for your reviewer:

N/A

[agones-bot]

Build Failed 😱

Build Id: d02a6c2d-ef39-4c88-8183-66d9484d53f3

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[agones-bot]

Build Failed 😱

Build Id: 72568eb9-ca28-49f6-be3d-7c957100d7d7

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[agones-bot]

Build Failed 😱

Build Id: 3ffeb5d5-afc4-4842-b23e-8ec7c39112dc

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[agones-bot]

Build Succeeded 👏

Build Id: 3302c982-1a52-4dc8-b7fd-a0c0e2a5a098

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.17.0-2864e19
• image: gcr.io/agones-images/agones-ping:1.17.0-2864e19
• Linux C++ SDK (build): agonessdk-1.17.0-2864e19-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.17.0-2864e19.zip

A preview of the website (the last 30 builds are retained):

• https://2864e19-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2198/head:pr_2198 && git checkout pr_2198
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.17.0-2864e19

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markmandel, roberthbailey

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