Jo bug/#178 home average per day

[jorandall]

Added check for average energy cost per day on homes dashboard, and makes it 0 if a negative number

Closes #178

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Name	Status	Preview	Comments	Updated (UTC)
new-forest-energy	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 24, 2023 7:49am

[WT000]

As spotted by Steven, it may be worth multiplying averagePerDay by the tariff (once the 0 check is done) as it's currently representing the kWh instead of the cost.

[jorandall]

Closes #189