fix(shape-6): fix sidebar-ideas internal icon

[marcosh-ramos]

The color of the sidebar-ideas icon is wrong, now it's always white as if it is selected

it should be kind of gray and just turn white on hover or when the item is active like the others

https://github.com/storyblok/storyblok-design-system/assets/7618411/05926610-087b-4448-acb5-45839feb9e7a

Pull request type

Jira Link: SHAPE-6

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Other (please describe):

How to test this PR

What is the new behavior?

Other information

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Name	Status	Preview	Updated (UTC)
storyblok-design-system	✅ Ready (Inspect)	Visit Preview	Jan 5, 2024 0:23am

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:tada: This PR is included in version 3.21.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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