Fill variant not working on `ProjectRoadmap` and `Project` icon

[theocrsb]

What happened?

What did you expect to happen?

No response

How can we reproduce it (as minimally and precisely as possible)?

The variant does not work in ORSD and OSRD-UI

On which environments the bug occurs?

Local Storybook, Deployed Storybook

On which browser the bug occurs?

Google Chrome

[axrolld]

@theocrsb how severe is this bug ?

[theocrsb]

I think the bug is minor