[BUG]: `scattergl` incorrectly handles numeric and numeric-string marker variants

[Lexachoc]

scattergl incorrectly handles numeric and numeric-string marker variants such as 100 / '100' ('circle-open'), 200 / '200' ('circle-dot') and 300 / '300' ('circle-open-dot').

The equivalent named symbols render correctly:

symbol: 'circle-open'
symbol: 'circle-dot'
symbol: 'circle-open-dot'

Reproducible example: https://codepen.io/Lexachoc/pen/gbmWRGM

This bug also affects all WebGL-based traces that reuse scattergl.

[camdecoster]

Thanks for report! I'll take a look at the PR you put together.