zweihander-osx: use eject instead of power

https://support.apple.com/en-us/HT201236 says that ⌃⌘⏏ will quit all apps and then restart your Mac; ⌃⌘-power will shut things down in an…ungraceful fashion.

I reboot into Windows fairly frequently; I'd rather have the nice behavior at my fingertips, not the rude one.

keyboard/ergodox_ez/keymaps/zweihander-osx/keymap.c

@@ -102,7 +102,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 /* Keymap 2: Media keys
  *
  * ,--------------------------------------------------.           ,--------------------------------------------------.
- * |        |  F14 |  F15 |      |      |      |      |           |  ⌘Q  |  ⌘W  | ⌘⇧`  |  ⌘`  |      |      |  Power |
+ * |        |  F14 |  F15 |      |      |      |      |           |  ⌘Q  |  ⌘W  | ⌘⇧`  |  ⌘`  |      |      |    ⏏   |
  * |--------+------+------+------+------+-------------|           |------+------+------+------+------+------+--------|
  * |        |      |      | PgUp |⌘S⌘⇥⌘R| Term |      |           |      |  ⌘]  | ⌥⌘↑  |   ↑  | ⌥⌘↓  |      |        |
  * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
@@ -131,7 +131,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
                                                     KC_HOME,
                                   KC_TRNS, KC_TRNS, KC_TRNS,
     // right hand
-       LGUI(KC_Q),  LGUI(KC_W),     LGUI(LSFT(KC_GRV)), LGUI(KC_GRV),   KC_TRNS,                KC_TRNS,        KC_PWR,
+       LGUI(KC_Q),  LGUI(KC_W),     LGUI(LSFT(KC_GRV)), LGUI(KC_GRV),   KC_TRNS,                KC_TRNS,        KC_EJCT,
        KC_TRNS,     LGUI(KC_RBRC),  LGUI(LALT(KC_UP)),  KC_UP  ,        LGUI(LALT(KC_DOWN)),    KC_TRNS,        KC_TRNS,
                     LGUI(KC_LBRC),  KC_LEFT,            KC_DOWN,        KC_RGHT,                KC_TRNS,        KC_MPLY,
        KC_TRNS,     LSFT(KC_SPC),   KC_SPC ,            KC_MPRV,        KC_MNXT,                KC_TRNS,        KC_TRNS,