tutorial: Fix typo
tutorial: Fix typo

Using backslash on Linux you get the following error:

  Error: Config file configconfig.xml not found at the specified location

Change-Id: I0d48df0c7be2d186c83da0740d50c8f7a06215d2
Reviewed-by: Tim Jenssen <6a21f175c697b4129e1bafb6e9b52078bb1a6738@digia.com>

olear/qtifw,olear/qtifw,olear/qtifw,olear/qtifw