[sr-dev] [kamailio/kamailio] core: ut - fixed str_casesearch() (#2743)

[Boris Korzun]

#### Pre-Submission Checklist
- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [x] Each component has a single commit (if not, squash them into one commit)
- [x] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [x] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
- [x] PR should be backported to stable branches
- [x] Tested changes locally
- [ ] Related to issue #XXXX

#### Description
There's an regression after 42228552b72267786561704f120e3da3aac5fd89 

`pike.so` was affected by the commit. RPC `pike.top` and `pike.list` commands didn't work.

`str_casesearch()` had returned NULL while text and needle were equal.



You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2743

-- Commit Summary --

  * core: ut - fixed str_casesearch()

-- File Changes --

    M src/core/ut.c (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2743.patch
https://github.com/kamailio/kamailio/pull/2743.diff

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