Need to fix mappings for 12 ISO codes in choropleth

[rando2]

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#569 generates maps showing clinical trial recruitment density by country. However, the ISO-to-map mappings treat certain geopolitical entities in sub-optimal ways (e.g., French Guiana shows up with the color assigned to France).
The codes handled this way are: 'LIE', 'MLT', 'GUF', 'SMR', 'HKG', 'GIB', 'BHR', 'MCO', 'UMI', 'IMN', 'SGP', 'MTQ'

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Looking at the Lowres dataset (which determines which regions of the map belong to each country), it should be possible to parse the multipolygon associated with a country like France, identify the part that describes French Guiana, and remove it from France + create a new row in the dataset. I haven't looked at the other countries, but presumably this is similar for all/most.

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We could ignore it since technically those are the correct ISO codes, but it detracts from the meaning of the figure and is questionable in a section where we're talking about issues with representation in clinicial trials.

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