BlazingTrail: Make sure the g component is not junk

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/Kaleidoscope/LED-Stalker.cpp

@@ -116,6 +116,7 @@ namespace KaleidoscopePlugins {
       BlazingTrail::compute (uint8_t step) {
         cRGB color;
 
+        color.g = 0;
         color.b = 0;
         color.r = step;