LED PWM ac_dimmer curve was wrongly applied instead of Gamma

[s-hadinger]

Description:

Fixes regression introduced in #17177 where ac_dimmer curve was applied instead of Gamma curve. Now the ac_dimmer is only applied if SetOption99 1 is applied.

Fixes #18639

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.9
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[stefanbode]

Thanks!!

[SteWers]

Is analogWrite still suitable at this place since PWM is no longer used with the new driver version?

[s-hadinger]

Is analogWrite still suitable at this place since PWM is no longer used with the new driver version?

I don’t know and I will let @stefanbode check what's needed there for ac dimmer

[stefanbode]

Let me check at the weekend. Right now I'm pretty sure the complete #ifdef zero cross dimmer can be moved away. Anyhow I want to check with a real device if this also works on the init and if there is a sideeffect if the led value is present at this time