deck.gl Multiple Layer no field for geospatial data

[mdZ01]

A clear and concise description of what the bug is.

Expected results

The UI displays fields for geospatial data for each/ all the layers.

Actual results

There is no (obvious) field for geospatial data.

Maybe include an example for deck.gl Multiple Layer will help understand how to use this visualization.

Screenshots

Not applicable.

How to reproduce the bug

Not applicable.

Environment

• superset version: 0.30
• python version: 3.6.8
• node.js version: 11.9
• npm version: -6.5.0

Checklist

Checked

• [ ] 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

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