[Qt-creator] Release mode builds debug by default

[Chris]

First off I have to say QtCreator is awesome.

I just ran into a bug today which causes projects with their active
configuration set to Release Mode to still build in Debug mode by
default.

If you create a new project and go to the Build&Run tab, then click on
Build Steps under the release mode settings, then click on Make in the
build steps list on the right side, you'll notice that the default
argument passed to make is "debug" instead of "release".

Regards,
~Chris