fix orders by multiple fields

[SntTGR]

example
query before:

...' INNER JOIN programs programs ON programs.id = schedules.id_program 
WHERE programs.id_program_type = 2 AND schedules.start > 9360 
ORDER BY start ASCend DESC 
LIMIT 1'

query after:

...' INNER JOIN programs programs ON programs.id = schedules.id_program 
WHERE programs.id_program_type = 2 AND schedules.start > 9360 
ORDER BY start ASC, end DESC 
LIMIT 1'