LU-12483 tests: fix sanity test 60h running conditions

LU-12483 tests: fix sanity test 60h running conditions

The test is supposed to run in DNE mode on 2.12.52 or above,
but the conditions are somehow reversed.

Change-Id: I322941a6098b0dbfbabe2f5c70f40f8e81d1bbab
Test-Parameters: trivial
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/35355
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>