Refactor Leader key feature (#19632)

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/splitkb/kyria/keymaps/asapjockey/keymap.c

@@ -171,16 +171,9 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     return true;
 }
 
-LEADER_EXTERNS();
-
-void matrix_scan_user(void) {
-    LEADER_DICTIONARY() {
-        leading = false;
-        leader_end();
-
-        SEQ_ONE_KEY(KC_F) { // Shift + Ctrl + F
-            tap_code16(S(C(KC_F)));
-        }
+void leader_end_user(void) {
+    if (leader_sequence_one_key(KC_F)) { // Shift + Ctrl + F
+        tap_code16(S(C(KC_F)));
     }
 }