Fixed transparent background not appearing with chart in dark mode
Fixed the transparent background not appearing when a chart is in dark mode. Previously it would pull the background colour from the dark theme, and now it gets it from the chart options.
Fixes #4541
Type of change
[x] Bug fix (non-breaking change which fixes an issue)
Checklist:
[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[x] My changes generate no new warnings
[x] New and existing unit tests pass locally with my changes
Fixed transparent background not appearing with chart in dark mode
Fixed the transparent background not appearing when a chart is in dark mode. Previously it would pull the background colour from the dark theme, and now it gets it from the chart options.
Fixes #4541
Type of change
Checklist: