Add KC_BSLS key to Horizon keyboard default layout (#14815)

* Define Horizon keyboard

* Set indentation according to QMK coding convention

* Update horizon keyboard readme to satisfy current QMK template

* Use row-column order in horizon readme

* Update keyboards/horizon/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/info.json

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/info.json

Co-authored-by: Ryan <fauxpark@gmail.com>

* Add KC_BSLS to Horizon default keymap

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/horizon/keymaps/default/keymap.c

@@ -34,14 +34,14 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     ),
     [_SYMBOL] = LAYOUT(
         KC_TILD, KC_1   , KC_2   , KC_3   , KC_4   , KC_5   ,                   KC_6   , KC_7   , KC_8   , KC_9   , KC_0   , KC_UNDS,
-        KC_PLUS, KC_EXLM, KC_LPRN, KC_RPRN, KC_DLR , KC_AMPR,                   KC_PIPE, KC_EQL , KC_LCBR, KC_RCBR, KC_COLN, KC_DQUO,
-        _______, KC_AT  , KC_LBRC, KC_RBRC, KC_HASH, KC_PERC, _______, _______, KC_CIRC, KC_ASTR, KC_LABK, KC_RABK, KC_QUES, _______,
+        KC_PLUS, KC_EXLM, KC_LPRN, KC_RPRN, KC_DLR , KC_AMPR,                   KC_PIPE, KC_HASH, KC_LCBR, KC_RCBR, KC_COLN, KC_DQUO,
+        _______, KC_AT  , KC_LBRC, KC_RBRC, KC_BSLS, KC_PERC, _______, _______, KC_CIRC, KC_ASTR, KC_LABK, KC_RABK, KC_QUES, _______,
         _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
     ),
     [_FUNCTION] = LAYOUT(
         _______, KC_F1  , KC_F2  , KC_F3  , KC_F4  , KC_PSCR,                   KC_SLCK, KC_HOME, KC_PGDN, KC_PGUP, KC_END , _______,
         _______, KC_F5  , KC_F6  , KC_F7  , KC_F8  , KC_INS ,                   KC_CLCK, KC_LEFT, KC_DOWN, KC_UP  , KC_RGHT, _______,
-        _______, KC_F9  , KC_F10 , KC_F11 , KC_F12 , _______, _______, _______, _______, KC_MUTE, KC_VOLD, KC_VOLU, EEP_RST, _______,
+        _______, KC_F9  , KC_F10 , KC_F11 , KC_F12 , _______, _______, _______, _______, KC_MUTE, KC_VOLD, KC_VOLU, KC_PAUS, _______,
         _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
     )
 };