Bugfix(/1239 flatten polygon line after delete point

[danielsteinkogler]

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[markus2330]

Please undraft PRs when inviting for reviews. What is the underlying issue for this PR?

[danielsteinkogler]

jenkins build please

[danielsteinkogler]

@markus2330 underlying issue: https://github.com/ElektraInitiative/PermaplanT/issues/1239

[markus2330]

Thx :heart: