Update electricity consumption numbers for BTC

• Updated KWh taken from the cited source's source (https://digiconomist.net/bitcoin-energy-consumption)
• Updated number of days of french households based on the average consumption given by the Que Choisir association (https://www.choisir.com/energie/articles/104333/la-consommation-electrique-moyenne-des-francais-en-2020)