docs: Fix config for JS choropleth example

[camdecoster]

Description

Fix config for JS choropleth example.

Notes

• The wrong config resulted in plotly.js to try to draw billions of ticks on the colorbar
• There were a couple of bugs in the config dating back to 2020
• I fixed one in a recent update and that caused the lag
• This change fixes the other bug and removes the lag. 18 ticks instead of billions.