Collect calibration: auto copy new hash into default.cfg (if user agrees)

[lecfab]

Purpose of this PR

While setting my first own calibration, i was confused by the several steps involved; this PR makes one of them automatic. Namely, after using ./collect_calibration, one has to copy paste the commit hash into a config file. This is now done automatically, upon user confirmation.

Do you think user confirmation is necessary? Does it happen that we don't want to copy the hash, or to copy it to a different file?

Here is the new terminal output:

Type of change

• [x] Minor change (default scenarios show only small differences)

Checklist:

• [x] My code follows the coding etiquette
• [x] I performed a self-review of my own code
• [x] I explained my changes within the PR, particularly in hard-to-understand areas
• [ ] I checked that the in-code documentation is up-to-date
• [ ] I adjusted the reporting in remind2 where it was needed
• [ ] I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches
• [ ] All automated model tests pass (FAIL 0 in the output of make test)
• [ ] The changelog CHANGELOG.md has been updated correctly

Further information (optional):

[LaviniaBaumstark]

I think, confirmation is necessary