Ticket #3026: Find File: "All charsets" options don't work.

(mc_search_prepare): use cp_display not cp_source to convert text to all
available charsets.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
lib/search/search.c: cosmetics.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Merge branch '3026_findfile_all_charsets'

* 3026_findfile_all_charsets:
  lib/search/search.c: cosmetics.
  Ticket #3026: Find File: "All charsets" options don't work.