Core/Auth: Fixed login for accounts with accented characters

Closes #16770

Conflicts:
	src/server/database/Database/Implementation/LoginDatabase.cpp

src/server/database/Database/Implementation/LoginDatabase.cpp

@@ -37,7 +37,7 @@ void LoginDatabaseConnection::DoPrepareStatements()
     PrepareStatement(LOGIN_DEL_ACCOUNT_BANNED, "DELETE FROM account_banned WHERE id = ?", CONNECTION_ASYNC);
     PrepareStatement(LOGIN_UPD_VS, "UPDATE account SET v = ?, s = ? WHERE username = ?", CONNECTION_ASYNC);
     PrepareStatement(LOGIN_UPD_LOGONPROOF, "UPDATE account SET sessionkey = ?, last_ip = ?, last_login = NOW(), locale = ?, failed_logins = 0, os = ? WHERE username = ?", CONNECTION_SYNCH);
-    PrepareStatement(LOGIN_SEL_LOGONCHALLENGE, "SELECT a.id, UPPER(a.username), a.locked, a.lock_country, a.last_ip, a.failed_logins, ab.unbandate > UNIX_TIMESTAMP() OR ab.unbandate = ab.bandate, "
+    PrepareStatement(LOGIN_SEL_LOGONCHALLENGE, "SELECT a.id, a.username, a.locked, a.lock_country, a.last_ip, a.failed_logins, ab.unbandate > UNIX_TIMESTAMP() OR ab.unbandate = ab.bandate, "
         "ab.unbandate = ab.bandate, aa.gmlevel, a.token_key, a.sha_pass_hash, a.v, a.s, a.battlenet_account "
         "FROM account a LEFT JOIN account_access aa ON a.id = aa.id LEFT JOIN account_banned ab ON ab.id = a.id AND ab.active = 1 WHERE a.username = ?", CONNECTION_ASYNC);
     PrepareStatement(LOGIN_SEL_RECONNECTCHALLENGE, "SELECT a.id, UPPER(a.username), a.locked, a.lock_country, a.last_ip, a.failed_logins, ab.unbandate > UNIX_TIMESTAMP() OR ab.unbandate = ab.bandate, "