[Rust][DataFusion] Fix regexp_match test

[asfimport]

The current location for the regexp_match will not work correctly with the feature flags.

Reporter: Mike Seddon / @seddonm1
Assignee: Mike Seddon / @seddonm1

PRs and other links:

• GitHub Pull Request #9874

_{Note: This issue was originally created as ARROW-12186. Please see the migration documentation for further details.}

[asfimport]

Andrew Lamb / @alamb:
Issue resolved by pull request 9874
#9874