Convert Encoder callbacks to be boolean functions (#12805)

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

keyboards/lck75/lck75.c

@@ -14,7 +14,8 @@
  */
 #include "lck75.h"
 
-__attribute__((weak)) void encoder_update_user(uint8_t index, bool clockwise) {
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!encoder_update_user(index, clockwise)) return false;
     if (index == 0) {
         if (clockwise) {
             tap_code(KC_VOLU);
@@ -22,6 +23,7 @@ __attribute__((weak)) void encoder_update_user(uint8_t index, bool clockwise) {
             tap_code(KC_VOLD);
         }
     }
+    return true;
 }
 
 #define IDLE_FRAMES 5