GUACAMOLE-394: Disambiguate "user_id" column, now that connection query joins the connection history table.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/resources/org/apache/guacamole/auth/jdbc/connection/ConnectionMapper.xml

@@ -146,7 +146,7 @@
                      open="(" separator="," close=")">
                 #{identifier,jdbcType=INTEGER}
             </foreach>
-            AND user_id = #{user.objectID,jdbcType=INTEGER}
+            AND [guacamole_connection_permission].user_id = #{user.objectID,jdbcType=INTEGER}
             AND permission = 'READ'
         GROUP BY [guacamole_connection].connection_id;