do not display diff result in script tests when -silent is used

Jonathan Poelenrequested to merge
work/jpoelen/no-diff-with-silent into master

Previously, XFAIL tests always displayed the diff result, even with -silent on the command line. Now, XFAIL no longer displays a diff.

I haven't found a way to do this only when -silent is used.

By the way, the tests are not autonomous, I need to set the XDG_DATA_HOME environment variable for them to work (I have my own indentation files).

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