[color theme][chart] When #series is larger than #color, the color start from random order to repeat

[jinghua-qa]

When number of series is larger than number of color, the color start from random order to repeat

How to reproduce the bug

Use clean_sales_data

1. Go to explore, create mixed time series chart
2. Select 'month' in group by
3. Select a color theme of 10 (for example d3 category 10)
4. See error

Expected results

When #series > #color, the series start from 1st color then repeat 1st color

Actual results

When #series > #color, the series start from random order then repeat 1st color

Screenshots

Environment

(please complete the following information):

• browser type and version: chrome
• superset version: master
• python version: python --version
• node.js version: node -v
• any feature flags active:

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

Add any other context about the problem here.