MBTA Custom Colors (+ bug fixes)

[annehaley]

This PR does the following:

• Add a postprocessing step after the conversion of the MBTA Rapid Transit dataset (assign "fill" and "stroke" properties according to the "LINE" property values).
• Modify client style management to apply "fill" and "stroke" colors if no colormap has been applied via the styling menu. These default colors on the vector properties are only shown if using the "single color" style mode. Features without the "fill" and "stroke" properties will use the selected single color (default blue)
• Fix a bug in the styling menu where the discrete/continuous control was incorrectly disabled
• Fix a bug in the map tooltip where the "Deactivate/Reactivate Node" button did not toggle correctly

The following screenshot displays the new default styling of the MBTA Rapid Transit dataset:

NOTE: In order to see these changes reflected, you need to reingest the MBTA Rapid Transit dataset. This can be done in two ways:

1. Delete the current version of the MBTA Rapid Transit dataset via the admin console then run docker compose run --rm django ./manage.py ingest boston_floods/data.json
2. Modify sample_data/boston_floods/data.json by adding "action": "replace" on line 42, then run the same command as option 1. You can undo the file modification afterwards.

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