Correct spelling of Fahrenheit.

[sjafferali]

Fixes #247 and #160.

Noticed the discrepancy in the original trace log:

2024-08-01T20:04:43.432208958Z [2024-08-01T13:04:43 DEBUG govee::hass_mqtt::climate] notify_state for Space Heater Pro (XXXXXXXXX H7133) targetTemperature
642
2024-08-01T20:04:43.432214580Z [2024-08-01T13:04:43 DEBUG govee::hass_mqtt::climate] have: DeviceCapabilityState { kind: TemperatureSetting, instance: "targetTemperature", state: Object {"value": Object {"targetTemperature": Number(75), "unit": String("Fahrenheit")}} }
643
2024-08-01T20:04:43.432796255Z [2024-08-01T13:04:43 DEBUG govee::hass_mqtt::climate] units are reported as Celsius
644
2024-08-01T20:04:43.432804395Z [2024-08-01T13:04:43 DEBUG govee::hass_mqtt::climate] reported temp is 75°C, pref_units: °C
645
2024-08-01T20:04:43.432806817Z [2024-08-01T13:04:43 DEBUG govee::hass_mqtt::climate] setting value to 75.00

[sjafferali]

@wez Can you have a look and let me know if anything else is needed to get this in?

[christiandennis]

Can we get this merged please <3

[wez]

Thanks!