Fix flatcar AMI filter

[kron4eg]

What this PR does / why we need it:
Seems like recently flatcar got new arm64 images, and THEY starter to return from search query, which leads to incompatible architecture errors between AMI and instance.

This PR fixes that problem

Fix flatcar AMI filter

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kron4eg

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[kubermatic-bot]

LGTM label has been added.

Git tree hash: 47a684ba79443742cd7780100807ed6f0ecd7a35

[xmudrii]

/cherrypick release/v1.3

[kubermatic-bot]

@xmudrii: once the present PR merges, I will cherry-pick it on top of release/v1.3 in a new PR and assign it to you.

In response to this:

/cherrypick release/v1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[kubermatic-bot]

@xmudrii: #1692 failed to apply on top of branch "release/v1.3":

Applying: Fix flatcar AMI filter
Using index info to reconstruct a base tree...
M	examples/terraform/aws/main.tf
M	examples/terraform/aws/output.tf
Falling back to patching base and 3-way merge...
Auto-merging examples/terraform/aws/output.tf
CONFLICT (content): Merge conflict in examples/terraform/aws/output.tf
Auto-merging examples/terraform/aws/main.tf
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Fix flatcar AMI filter
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release/v1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[kron4eg]

cherry pick: #1693