Fixed wrong ELK detector

[nirname]

:bookmark_tabs: Summary

Brief description about the content of your PR.

Resolves #5507

:straight_ruler: Design Decisions

We have to check only the beginning of the line so we need grouping. This

/^\s*flowchar|graph/.test("some graph")

was returning true, but it should not.

:clipboard: Tasks

Make sure you

• [x] :book: have read the contribution guidelines
• [x] :computer: have added necessary unit/e2e tests.
• [ ] :notebook: have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• [x] :bookmark: targeted develop branch

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 5.73%. Comparing base (0044aa3) to head (66cd0b9).

Additional details and impacted files

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[varon]

Thanks for the fix - code LGTM.