GUAC-1101: Username parameter of selectOne() is "username", not "identifier".

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-mysql/src/main/resources/org/glyptodon/guacamole/auth/jdbc/user/UserMapper.xml

@@ -110,7 +110,7 @@
             password_salt
         FROM guacamole_user
         WHERE
-            username = #{identifier,jdbcType=VARCHAR}
+            username = #{username,jdbcType=VARCHAR}
 
     </select>