Grouped bar chart colouring by category not group

[JamesLMYoung]

Grouped bar chart colouring by category not group (this worked in 2.4.0)

• NeoDash version: 2.4.10
• Neo4j Database version: 2025.02.0 (Enterprise).

Steps to reproduce

1. Create bar chart
2. Use group in advanced settings
3. Show legend

Expected behavior

• The groups should be coloured
• Groups should be shown in the legend with there colour

Actual behavior

• The bars are coloured
• Groups are shown with the colour of the first bar in the legend