Use QString::fromLatin1 instead of QString::fromAscii

There is no good reason to break the Qt coding style, here. The
strings "%1/../Resources/%2" and "%1/../%2" are Latin1 aswell
as Ascii.

Change-Id: Idbf3b7650fd650f93293496839fec4d21626cd0b
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>