Improvements to Custom Destinations Jump List parser

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.08696% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 85.25%. Comparing base (fa59328) to head (ea0466f).

Files	Patch %	Lines
plaso/parsers/custom_destinations.py	76.08%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4832 +/- ## ========================================== + Coverage 85.22% 85.25% +0.02% ========================================== Files 426 426 Lines 38532 38532 ========================================== + Hits 32840 32849 +9 + Misses 5692 5683 -9 ```

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