`SHOW GRANTS` doesn't show grants correctly

[jycor]

dolt:

test_db> create user test_user;
Query OK, 0 rows affected
test_db> show grants for test_user;
+--------------------------------------+
| Grants for test_user@%               |
+--------------------------------------+
| GRANT USAGE ON *.* TO `test_user`@`` |
+--------------------------------------+
test_db> grant select on test_db.* to test_user;
Query OK, 0 rows affected
test_db> show grants for test_user;
+--------------------------------------+
| Grants for test_user@%               |
+--------------------------------------+
| GRANT USAGE ON *.* TO `test_user`@`` |
+--------------------------------------+

mysql:

mysql> create user test_user;
Query OK, 0 rows affected (0.0037 sec)
mysql> show grants for test_user;
+---------------------------------------+
| Grants for test_user@%                |
+---------------------------------------+
| GRANT USAGE ON *.* TO `test_user`@`%` |
+---------------------------------------+
mysql> grant select on test_db.* to test_user;
Query OK, 0 rows affected (0.0033 sec)
mysql> show grants for test_user;
+------------------------------------------------+
| Grants for test_user@%                         |
+------------------------------------------------+
| GRANT USAGE ON *.* TO `test_user`@`%`          |
| GRANT SELECT ON `test_db`.* TO `test_user`@`%` |
+------------------------------------------------+

However, the privileges do appear to work (prevents test_user from everything other than selecting from test_db), so this is just a problem with show grants.

[jycor]

Fix is merged to main