fix cabal plan style: inplace

[manveru]

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[CLAassistant]

All committers have signed the CLA.

[csasarak]

Hi, thank you for this contribution. Unfortunately due to the way our CI works (we pull in a few proprietary executables) I have to make a new PR with it. You will still be credited for the work of course.

[csasarak]

Please see #1260