Ticket #3219: mcviewer: fix switch between raw and parse modes.

Partially revert 2640b21bb9700aa51a70f35f9e10732c82a7366f
for src/mcviewer/lib.c file.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Merge branch '3219_mcviewer_raw_parse_switch'

* 3219_mcviewer_raw_parse_switch:
  Ticket #3219: mcviewer: fix switch between raw and parse modes.