resolves #497 new delete configuration message for uninstaller

[julianseeger]

remonder if someone wants to test this:

vagrant up installer    # starts a docker container via vagrant building a setup
docker ps | grep installer | cut -d' ' -f1 | xargs docker logs -f     # tails the containers logs

btw.: Warning: The [Setup] section directive "UninstallIconFile" is obsolete and ignored in this version of Inno Setup.

[julianseeger]