QtIFW

Fix tmp file removal

Tmp files were not removed when all or these were met:
1. Using Linux
2. Installing to a folder which needs authorization
3. Installing a component which has no metadata
Tmp 'remoterepo-XXXXXX' is created before acquiring authorization.
In previous version if above list was met, a tmp folder was created
inside remoterepo-XXXXX after authorization leading to permission
error when deleting the folder.

Task-id: QTIFW-1268
Change-Id: I937fe3ce13440c817d1264c80ad060dfc966e456
Reviewed-by: Iikka Eklund <iikka.eklund@qt.io>