Remove legacy keycodes, part 4 (#18683)

* `KC_PGDOWN` -> `KC_PGDN`

* `KC_PSCREEN` -> `KC_PSCR`

* `KC_SCOLON` -> `KC_SCLN`

* `KC_BSLASH` -> `KC_BSLS`

* `KC_BSPACE` -> `KC_BSPC`

keyboards/signum/3_0/keymaps/sgurenkov/keymap.c

@@ -117,7 +117,7 @@ void matrix_scan_user(void) {
 
             tap_code(KC_RIGHT);
 
-            tap_code(KC_BSPACE);
+            tap_code(KC_BACKSPACE);
 
             unregister_code(KC_LGUI);
         }