Accessibility -> Contrast Errors with the left navigation menu items when in active mode

## Description
**How to replicate:**
* Navigate to the A&R website on Test environment: [A&R Admin](https://d3ahrzu0mpndj3.cloudfront.net/)
* Using the **_WAVE_** browser extension, check the accessibility issues on the page

**Issues:**
* The left navigation menu items have a very low contrast when displayed with Active link styles


## Linked issues
relates to
- [x] ~[BRS-822](https://bcparksdigital.atlassian.net/browse/BRS-822)~

Open the A&R Admin test environment and reproduce the left navigation contrast issue with the WAVE browser extension. Inspect the project’s navigation styling entry point, then verify that active menu items meet the reported contrast requirement and that WAVE no longer flags them.

Written by the indexing model from the issue text.