fix(segment): default ripple to currentColor

[brandyscarney]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

First way to reproduce

1. Go to the following test on master: http://localhost:3333/src/components/segment/test/toolbar
2. Click the second segment, and notice the ripple isn't visible.
3. Repeat on branch to see it fixed

Second way to reproduce

1. Go to the following test on master in full screen mode: http://localhost:3333/src/themes/test/css-variables
2. Click on the "dark" theme from the select in the upper right
3. Click on the segment in the toolbar, see that the ripple background is blue
4. Repeat on branch to see it fixed

Issue Number: N/A

What is the new behavior?

Updates the ripple-color to use currentColor, this fixes an issue with themed toolbars so that it doesn't use the default (primary) color.

Does this introduce a breaking change?

• Yes
• No

Other information