Issue1032 bug duplicates calibration

[jhmigueles]

Fixes #1032 => Fixes minor bug in g-calibrate when no non-movement periods are found to calibrate the data.

Checklist before merging:

• [x] Existing tests still work (check by running the test suite, e.g. from RStudio).
• [ ] Added tests (if you added functionality) or fixed existing test (if you fixed a bug).
• [ ] Updated or expanded the documentation.
• [x] Updated release notes in inst/NEWS.Rd with a user-readable summary. Please, include references to relevant issues or PR discussions.
• [ ] Added your name to the contributors lists in the DESCRIPTION file, if you think you made a significant contribution.

[vincentvanhees]

Thanks, I prefer to first review and merge https://github.com/wadpac/GGIR/pull/1027 because your edits affect the same code that is revised in that branch and I think it is easier to update your branch with her work then visa versa.