es_out: fix ES unselect order from EsOutSelectList

1/ Unselect all ESes not matching the list
2/ Select all ESes matching the list

This avoids having more than one ESes selected when avoidable. Having
more than one ESes selected is supported for VIDEO_ES and SPU_ES but not
for AUDIO_ES (EXCLUSIVE policy).

This commit fixes the EXCLUSIVE policy that was not respected by
EsOutSelectList().