Fix fan modes for 99432

[Koenkk]

See Koenkk/zigbee2mqtt#7359

@cmccambridge please review

[cmccambridge]

Modes look good 👍 I'll update my PR to only add the fan's existing modes in the HA discovery message.

My only remaining question (which might belong back on the zigbee2mqtt PR) is whether we can do anything special with the home assistant discovery to present this specific fan as "4 speeds" plus "1 preset", versus the generic ZCL "3 speeds" plus "2 presets" (on, smart). And if we do: Does that happen here in the converters, or only in the home assistant extension?

Summarizing the ideal state of a generic zigbee fan versus the 99432 fan:

ZCL HVAC FanMode Attribute	ZCL Description	Generic Fan HA Discovery	99432 Meaning	99432 HA Discovery
0x00	Off	State: Off	Off	State: Off
0x01	Low	Speed: 1	Low	Speed: 1
0x02	Medium	Speed: 2	Medium	Speed: 2
0x03	High	Speed: 3	High	Speed: 3
0x04	On	State: On	Very High	Speed: 4
0x05	Auto (the fan speed is self-regulated)	Preset: auto	(unused)	--
0x06	Smart (when the heated/cooled space is occupied, the fan is always on)	Preset: smart	"Comfort Breeze"	Preset: Smart

(Edit: Just to be clear: The modes in this PR are definitely correct. If we were looking at the "Exposes" tab in the zigbee2mqtt web frontend, those are exactly the modes I would expect to see in the list for 99432 😄. The question about "4 speeds and 1 preset" is only a question for the Home Assistant discovery extension.)

[Koenkk]

@cmccambridge we should deal with this in the home assistant extension since it's HA specific.

[cmccambridge]

Perfect, looks great!