mqtt-hassio.cfg: match kWh for energy device_class/state_class

[ebaschiera]

The energy rule in type_switch-number only matched the unit Wh, so energy sensors reporting in kWh (without "energy" in their name) were published without device_class: energy / state_class: total_increasing and were therefore excluded from long-term statistics and the Energy dashboard.

Example: Vaillant StatFuelSum (gas counter, kWh).

This adds ,kWh$ as an explicit alternative, mirroring how the power rule already lists ,kW$|,W$. Tested on ebusd 26.1: a kWh sensor now gets device_class: energy + state_class: total_increasing.

Note: the yield rule below (total*,Wh$) has the same limitation; left unchanged here to keep the fix minimal — happy to extend it (and add MWh) if preferred.

Refs #1756