Fix unclosed DIR when targeting keyboard

src/light.c

 
   if(light_iteratorDir == NULL)
   {
-    light_iteratorDir = opendir("/sys/class/backlight");
     if(light_Configuration.target == LIGHT_KEYBOARD)
     {
       light_iteratorDir = opendir("/sys/class/leds");
     }
+    else
+    {
+      light_iteratorDir = opendir("/sys/class/backlight");
+    }
     if(light_iteratorDir == NULL)
     {
       LIGHT_ERR("could not open backlight or leds directory");