Resolve bug in the PrometheusRule for line in falco exporter

[jochbru]

This fixes a bug I introduced myself earlier

What type of PR is this?

/kind bug

/kind chart-release

/area falco-exporter-chart

Checklist

• [x] Chart Version bumped
• [x] Variables are documented in the README.md
• [x] CHANGELOG.md updated

[alacuku]

hi @jochbru, a rebase on top of the main branch should solve the CI issue.

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alacuku, jochbru

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[poiana]

LGTM label has been added.

Git tree hash: 973ade750b8a65b6750f7e4de141f75ff56f83ab

[alacuku]

Thank you @jochbru