Replace tab indentation with spaces in is0 default keymap. (#8368)

keyboards/illuminati/is0/keymaps/default/keymap.c

@@ -32,7 +32,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
       if (record->event.pressed) {
         SEND_STRING("Hello from Illuminati Works");
       } else {
-		SEND_STRING("iS0 working properly");
+        SEND_STRING("iS0 working properly");
       }
       break;
   }