Country code of the UK

[rahul-ahuja]

Describe the bug

Country code of the UK is not consistent. In the solar_consumer/app.py file, the country code of the UK defaults to 'uk' but in the solar_consumer/fetch_data, it defaults to 'gb'

This issue was raised due to the suggestion to use 'gb' in #42 (comment)

https://github.com/openclimatefix/solar-consumer/blob/main/solar_consumer/app.py
https://github.com/openclimatefix/solar-consumer/blob/main/solar_consumer/fetch_data.py

Potential Solution:

Either have only one code for the UK or both codes of 'uk' and 'gb' should trigger fetching the UK data.

@pjireland

[peterdudfield]

Please change to gb, UK normally include Northern Ireland,