RFR: 7299: Accessibility Issue - Too low contrast on rule result values

[Marcus Hirt]

On Wed, 16 Jun 2021 20:47:40 GMT, Suchita Chaturvedi <schaturvedi at openjdk.org> wrote:

> This PR addresses an accessibility issue where the contrast of the rules score on Automated Analysis screen is too low.
> 
> Please review the change and let me know if any changes are required.
> 
> The UI looks like this now:
> 
> ![image](https://user-images.githubusercontent.com/11155712/122291146-1c887d00-cf12-11eb-957f-03f662f2805f.png)

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/268