bugfix in wrap function and firwork FX

wled00/FX.cpp

@@ -8063,7 +8063,7 @@ uint16_t mode_particlefireworks(void)
 
   if (SEGMENT.call == 0) // initialization 
   {
-    if (!initParticleSystem(PartSys, NUMBEROFSOURCES)) // init, no additional data needed
+    if (!initParticleSystem(PartSys, NUMBEROFSOURCES, true)) // init with advanced particle properties
       return mode_static(); // allocation failed; //allocation failed
     PartSys->setKillOutOfBounds(true);  //out of bounds particles dont return (except on top, taken care of by gravity setting)
     PartSys->setWallHardness(100); //ground bounce is fixed

wled00/FXparticleSystem.cpp

@@ -1207,18 +1207,20 @@ void ParticleSystem::collideParticles(PSparticle *particle1, PSparticle *particl
 
 }
 
-//fast calculation of particle wraparound (modulo version takes 37 instructions, this only takes 28, other variants are slower on ESP8266)
+//calculation of particle wraparound
 //function assumes that out of bounds is checked before calling it
 int32_t ParticleSystem::wraparound(int32_t p, int32_t maxvalue)
 {
+	/* 
+	//variant without modulo (but is unsafe, far out particles will not get wrapped!) TODO: !!! remove this variant
 	if (p < 0)
-	{
 		p += maxvalue + 1;
-	}
 	else //if (p > maxvalue) 
-	{
 		p -= maxvalue + 1;
-	}
+	return p;*/
+	p = p % (maxvalue + 1);
+	if (p < 0)
+		p = maxvalue - p;
 	return p;
 }