Geomap: Add more countries ISO 3166 Alpha-3-code to the gazetteer/countries.json

[alexsan92]

Included in the changes:

1. ALA, reference: https://www.iso.org/obp/ui/#iso:code:3166:AX
2. BLM, reference: https://www.iso.org/obp/ui/#iso:code:3166:BL
3. BES, reference: https://www.iso.org/obp/ui/#iso:code:3166:BQ
4. CUW, reference: https://www.iso.org/obp/ui/#iso:code:3166:CW
5. MAF, reference: https://www.iso.org/obp/ui/#iso:code:3166:MF
6. SXM, reference: https://www.iso.org/obp/ui/#iso:code:3166:SX

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• It works as expected from a user's perspective.
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[drew08t]

Thanks for the contribution Alex, LGTM!