[Keyboard] Fix incorrect RGBLED_NUM value (#6148)

KBD67 Rev 2 has 20 LEDs, not 18. This was causing 2 of the underglow LEDs to remain off. This fix updates that.

keyboards/kbdfans/kbd67/rev2/config.h

@@ -56,7 +56,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define RGB_DI_PIN E2
 #ifdef RGB_DI_PIN
 #define RGBLIGHT_ANIMATIONS
-#define RGBLED_NUM 18
+#define RGBLED_NUM 20
 #define RGBLIGHT_HUE_STEP 8
 #define RGBLIGHT_SAT_STEP 8
 #define RGBLIGHT_VAL_STEP 8