Nebula12 RGBLIGHT buffer workaround (#10555)

* Work around for rgblight buffer

* Update config.h

* Prettify

* Clip led range

keyboards/nebula12/config.h

@@ -41,6 +41,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
 #define DEBOUNCE 5
 
+/* Ensure we jump to bootloader if the RESET keycode was pressed */
+#define EARLY_INIT_PERFORM_BOOTLOADER_JUMP TRUE
+
 /* Setting up 400KHz I2C Clock for a 48MHz system clock */
 #define I2C1_SCL_PAL_MODE 1
 #define I2C1_SDA_PAL_MODE 1
@@ -95,12 +98,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define RGB_DI_PIN B15
 #ifdef RGB_DI_PIN
-  #define RGBLED_NUM 4
+  #define RGBLED_NUM 10 /* If number is smaller, buffer updates too fast causing glitches */
   #define RGBLIGHT_HUE_STEP 8
   #define RGBLIGHT_SAT_STEP 8
   #define RGBLIGHT_VAL_STEP 8
   #define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */
-  #define RGBLIGHT_SLEEP  /* If defined, the RGB lighting will be switched off when the host goes to sleep */
   #define RGBLIGHT_ANIMATIONS
 #endif