Editor: Remove trailing whitespaces in generated files.

Task-number: QTCREATORBUG-9833

Change-Id: I7440d1e7c8ef303db1b6abfa8cd12325b934b0d2
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@digia.com>