[patch] fix /src/editor testsuite failure when ncurses is used

[and]

fix /src/editor testsuite failure when ncurses is used

 Running suite /src/editor
 (null):-1:S:Core:test_autocomplete:0: (after this point) Received signal 11 (Segmentation fault)
 (null):-1:S:Core:test_autocomplete:1: (after this point) Received signal 11 (Segmentation fault)
 (null):-1:S:Core:test_autocomplete_single:0: (after this point) Received signal 11 (Segmentation fault)
 Results for all suites run:
 0%: Checks: 3, Failures: 0, Errors: 3

testsuite failed because ncurses:doupdate() called without proper init

 edit_init()
   -> edit_load_file()
      -> edit_load_file_fast()
         -> status_msg_init()
            -> mc_refesh()
               -> ncurses/tty_refresh()
                  -> doupdate()

patch against 52fd328042a426e885da891c8ce8218cda3a1cf7
compile test with GCC 5.2.0/ncurses 5.9

Signed-off-by: Andreas Mohr <and@…>