Convert Encoder callbacks to be boolean functions (#12805)

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

keyboards/nightly_boards/adellein/adellein.c

@@ -21,7 +21,8 @@ void matrix_scan_kb(void) {
     matrix_scan_user();
 }
 
-void encoder_update_kb(uint8_t index, bool clockwise) {
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+//    if (!encoder_update_user(index, clockwise)) return false;
     encoder_action_register(index, clockwise);
-    // encoder_update_user(index, clockwise);
-};
+    return true;
+};