RFR: 7903017: RunTestsHandler passes arguments to lastIndexOf in the wrong order

[Dmitry Bessonov]

On Mon, 23 Aug 2021 23:27:34 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

> This fixes a bug where the arguments to to `lastIndexOf` were swapped.
> 
> The first argument to `String#lastIndexOf(int, int)` is a character to search for, the second argument is a start index.

Marked as reviewed by dbessono (Committer).

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PR: https://git.openjdk.java.net/jtharness/pull/12