bugfix: avoid double blanking segments

if both seg.reset and seg.needsBlank were set, this caused a second (unwanted) blanking in frame 1.

Author: softhack007

wled00/FX_fcn.cpp

@@ -277,7 +277,7 @@ void Segment::resetIfRequired() {
     next_time = 0; step = 0; call = 0; aux0 = 0; aux1 = 0;
     reset = false; // setOption(SEG_OPTION_RESET, false);
     startFrame();   // WLEDMM update cached propoerties
-    if (isActive() && !freeze) fill(BLACK); // WLEDMM start clean
+    if (isActive() && !freeze) { fill(BLACK); needsBlank = false; } // WLEDMM start clean
     DEBUG_PRINTLN("Segment reset");
   } else if (needsBlank) {
     startFrame();   // WLEDMM update cached propoerties