fix(full-text-search) fix fuzzy's prefix length, edit distance and idf

[Viatorus]

…ation for fuzzy query

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/LokiJS-Forge/LokiJS2/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[coveralls]

Coverage increased (+0.04%) to 92.452% when pulling ed7f2a5 on fix_fuzzy into ff74219 on master.

[coveralls]

Coverage increased (+0.04%) to 92.452% when pulling ed7f2a5 on fix_fuzzy into ff74219 on master.