engine : spelling mistakes in engine event log

In the event log there is 'choosen' and it should be 'chosen'.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1021360

Change-Id: I9efd9cfa8ac993ee2add44bda1af1e0fcf5f7ea9
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>