Fix leds getting unset when closing the program

tools/gsr-global-hotkeys/leds.h

@@ -4,6 +4,14 @@
 /* C stdlib */
 #include <stdbool.h>
 
+typedef struct {
+    /* These are set to -1 if not supported */
+    int scroll_lock_brightness;
+    int num_lock_brightness;
+    int caps_lock_brightness;
+} ggh_leds;
+
 bool set_leds(const char *led_name, bool enabled);
+bool get_leds(int event_number, ggh_leds *leds);
 
 #endif /* LEDS_H */