Remove legacy keycodes, part 2 (#18660)

* `KC_SYSREQ` -> `KC_SYRQ`

And one `KC_ALT_ERASE` -> `KC_ERAS`

* `KC_NONUS_BSLASH` -> `KC_NUBS`

* `KC_NUMLOCK` -> `KC_NUM`

* `KC_CLCK` -> `KC_CAPS`

* `KC_SCROLLLOCK` -> `KC_SCRL`

* `KC_LBRACKET` -> `KC_LBRC`

* `KC_RBRACKET` -> `KC_RBRC`

* `KC_CAPSLOCK` -> `KC_CAPS`

layouts/community/ergodox/albert/keymap.c

@@ -8,7 +8,7 @@
 /* use UK keymap */
 
 #define UK_HASH KC_NONUS_HASH
-#define UK_BSLS KC_NONUS_BSLASH
+#define UK_BSLS KC_NONUS_BACKSLASH
 #define UK_PIPE LSFT(UK_BSLS)
 
 #define BASE 0 // default layer