Group legend and group tooltip colors don't match getFillColor defined color

[icaro1508]

I am submitting a...

• Feature request
• Design defect
• Source code defect
• Demo/documentation defect
• Other

charts version:

@carbon/charts: "0.38.0"
@carbon/charts-react: "0.38.0"

Issue description

Group color in tooltip and legend doesn't match the color provided by the BaseChartOptions.getFillColor

Steps to produce the issue

• Create a new CRA project
• Install carbon-components and @carbon/charts-react
• Import chart styles
• Create new Component that uses some chart (I only tested the SimpleBarChart component)
• Set getFillColor function to return a static value (in the CodeSandbox example rgb(110, 50, 201))
• Hover over bars for tooltip or check group color in legend

Current behavior

Group legend and group in tooltip colors don't match fill color defined by getFillColor function

Expected behavior

Group legend and group in tooltip colors should match fill color defined by getFillColor function

Screenshot or recording

Link to Running Demo

CodeSandBox

[icaro1508]

Just wanna say, awesome work with the components!

I might be willing to take a look at this overt the weekend if you guys want

P.S.: I know it's not really related to the issue but this is my first issue ever on GitHub and I didn't really manage to label it as a bug, so, sorry about that...