fix particle brightness distribution with new gamma correction (#4710)

Particle System depends on linear brightness distribution, gamma corrected values are non-linear.
- added invers gamma table
- reversing gamma after brightness distribution makes it linear once again

wled00/set.cpp

@@ -341,7 +341,7 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
       gammaCorrectBri = false;
       gammaCorrectCol = false;
     }
-    NeoGammaWLEDMethod::calcGammaTable(gammaCorrectVal); // fill look-up table
+    NeoGammaWLEDMethod::calcGammaTable(gammaCorrectVal); // fill look-up tables
 
     t = request->arg(F("TD")).toInt();
     if (t >= 0) transitionDelayDefault = t;