Improvements to extrakey HID descriptors (#8156)

tmk_core/protocol/lufa/lufa.c

@@ -690,7 +690,7 @@ static void send_extra(uint8_t report_id, uint16_t data) {
  */
 static void send_system(uint16_t data) {
 #ifdef EXTRAKEY_ENABLE
-    send_extra(REPORT_ID_SYSTEM, data - SYSTEM_POWER_DOWN + 1);
+    send_extra(REPORT_ID_SYSTEM, data);
 #endif
 }