com.atlassian.jira.issue.customfields.manager.OptionsManager#findByOptionValue doesn't support values with an ß character

Summary

Passing "Dießl" in OptionsManager#findByOptionValue returns an empty list even if it exists; calling OptionsManager#getAllOptions shows "Dießl".

Steps to Reproduce

1. Create a list with "Dießl"
2. In your code, pass "Dießl" in OptionsManager#findByOptionValue

Expected Results

The returned list contains "Dießl".

Actual Results

Empty list.

Notes

Seems to be caused by CaseFolding#foldString as mentioned in DEVHELP-1018. In Java, using String#toUppercase to "ß" changes it to "SS", hence, causes the problem.