feat: set x-frame-options to sameorigin instead to deny

Description

How to test

Author's checklist

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• This MR has been tested or does not change functionality
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Reviewer's checklist

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Other information

Tested on id-test and works as intended. (Requested by muni user)

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Related issues

requested review from @445348

assigned to @469355

changed the description

added manual testdone label

added waiting for review1 label

approved this merge request

merged

mentioned in commit 423d8da2

This MR is included in version 18.6.0

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