Fix German time frames

[weddige]

The rules for German timeframes for only_distance=True where incomplete.

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• [ ] 🧪 Added tests for changed code.
• [x] 🛠️ All tests pass when run locally (run tox or make test to find out!).
• [ ] 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• [ ] 📚 Updated documentation for changed code.
• [x] ⏩ Code is up-to-date with the master branch.

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Description of Changes

This PR fixes several missing cases in GermanBaseLocale.

[codecov[bot]]

Codecov Report

Merging #922 (1450592) into master (87cd4a9) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #922   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9        10    +1     
  Lines         1886      1896   +10     
  Branches       311       311           
=========================================
+ Hits          1886      1896   +10     

Impacted Files	Coverage Δ
arrow/locales.py	100.00% <100.00%> (ø)
arrow/__init__.py	100.00% <0.00%> (ø)

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[jadchaar]

Thanks for the contribution @weddige, much appreciated!