[WIP] Fix wrongly named variable in calibration.gui

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>wrongly named variable</issue_title>
<issue_description>I got en error running the softwaren in the calibration.gui file on line 624 and 625. For me it was fixed by changing 'man_ori_path' to 'self.man_ori_dat_path' on line 624 and 'self.man_ori_path' to 'self.man_ori_dat_path' on line 625.</issue_description>

<agent_instructions>check this bug and add a test to catch this in time </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes wrongly named variable #64

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