Convert Encoder callbacks to be boolean functions (#12805)

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

keyboards/dmqdesign/spin/keymaps/gorbachev/keymap.c

@@ -61,7 +61,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     return true;
 };
 
-void encoder_update_user(uint8_t index, bool clockwise) {
+bool encoder_update_user(uint8_t index, bool clockwise) {
     if (index == 0) { /* First encoder */
         switch (get_highest_layer(layer_state)) {     //break each encoder update into a switch statement for the current layer
             case _NUMPAD:
@@ -135,6 +135,7 @@ void encoder_update_user(uint8_t index, bool clockwise) {
                 break;
         }
     }
+    return true;
 }
 
 layer_state_t layer_state_set_user(layer_state_t state) { //This will run every time the layer is updated