Pie chart does not use the actual percentages

[BasJ93]

As a user, I expect the pie chart to reflect the percentages, not the actual consumed grams.

Acceptance Criteria

• [x] Does the pie chart show the calculated percentages?
• [x] Does the pie chart no longer show the actual grams consumed?

[BasJ93]

16 already requires the calculation of the percentages. Combine the issues when implementing.