QtIFW

Fix install type if --online-only passed to binarycreator

Binarycreator assumed that install type is offline if no repositories
was set although --online-only was set. However, repositories might
be set later, for example in producetkeycheck::init().

Change-Id: Idd6d0e3304974773baefe3773be7e2948704575c
Reviewed-by: Iikka Eklund <iikka.eklund@qt.io>