QtIFW

fix empty installer.components array

Make sure the current list of components is used when referencing
installer.components in a controller script.

Change-Id: I9468110d61a958f13edba66da0059d6622aa7037
Task-number: QTIFW-601
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@theqtcompany.com>