[Keymap] Clean up / adjust khord let's split keymap (#6951)

Remove unneeded lines and change right side mouse buttons on raise layer back to media control

keyboards/lets_split/keymaps/khord/keymap.c

@@ -1,6 +1,5 @@
 #include QMK_KEYBOARD_H
 
-
 extern keymap_config_t keymap_config;
 
 #define _QWERTY 0
@@ -25,7 +24,6 @@ enum {
 // Dylan's additions
 #define C_A_DEL LALT(LCTL(KC_DEL))
 #define C_A_INS LALT(LCTL(KC_INS))
-//#define MAC_LOK S(LCTL(KC_PWR))
 #define MAC_LOK LCTL(LGUI(KC_Q))
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
@@ -81,7 +79,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC, \
   KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS, \
   _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  _______, _______, KC_PGDN, KC_PGUP, _______, \
-  _______, _______, _______, _______, _______, _______, _______, _______, KC_BTN1, KC_BTN2, KC_BTN3, KC_BTN4 \
+  _______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY \
 ),
 
 /* Adjust (Lower + Raise)