[Keyboard] Fix jian backlight related ifdefs (#10679)

* Add jian backlight enabled ifdefs

* Fix adavnced layout LAYOUT_dips usage

keyboards/jian/rev2/rev2.c

@@ -14,6 +14,7 @@ const keypos_t hand_swap_config[MATRIX_ROWS][MATRIX_COLS] = {
 };
 #endif
 
+#ifdef BACKLIGHT_ENABLE
 static bool backlight_was_toggled = false;
 
 void suspend_power_down_kb(void) {
@@ -29,6 +30,7 @@ void suspend_wakeup_init_kb(void) {
         backlight_was_toggled = false;
     }
 }
+#endif
 
 #ifdef PHYSICAL_LEDS_ENABLE
 void led_init_kb(void)