Merge pull request #5007 from benjamw/twinkle_fixes_15_x

Fix blank area issue with Twinkle

Author: netmindz

wled00/FX.cpp

@@ -580,7 +580,7 @@ uint16_t mode_twinkle(void) {
     SEGENV.step = it;
   }
 
-  unsigned PRNG16 = SEGENV.aux1;
+  uint16_t PRNG16 = SEGENV.aux1;
 
   for (unsigned i = 0; i < SEGENV.aux0; i++)
   {