fix: wrong previousRoute after back journey

[bchelkowski]

What did you implement:

Closes #56

How did you implement it:

Save the latest item from kept history items instead of the current activeRoute. It will also do that if the activeRoute should be skipped in the history.

How can we verify it:

The previousRoute should have the correct value always.

Todos:

• [x] Write documentation (if required)
• [x] Fix linting errors
• [x] Enable "Allow edits from maintainers" for this PR
• [x] Update the messages below

Is this ready for review?: YES Is it a breaking change?: NO

[github-actions[bot]]

:tada: This PR is included in version 2.1.5 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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