Limit layers we work on to max_layers_

The plugin should not try to set the colors of a layer higher than
`max_layers_`, because the colormap for that would be coming from an EEPROM area
that is not ours, and result in weird colors at best.

Signed-off-by: Gergely Nagy <kaleidoscope@gergo.csillger.hu>

src/Kaleidoscope/Colormap.cpp

@@ -44,6 +44,7 @@ void ColormapEffect::max_layers(uint8_t max_) {
 
 void ColormapEffect::onActivate(void) {
   last_highest_layer_ = Layer.top();
+  if (last_highest_layer_ <= max_layers_)
     ::LEDPaletteTheme.updateHandler(map_base_, last_highest_layer_);
 }
 
@@ -55,6 +56,7 @@ void ColormapEffect::update(void) {
 }
 
 void ColormapEffect::refreshAt(byte row, byte col) {
+  if (last_highest_layer_ <= max_layers_)
     ::LEDPaletteTheme.refreshAt(map_base_, last_highest_layer_, row, col);
 }