[GeneratorBundle] Fix demo site datafixtures url validation errors #2767
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This PR fixes the issues that internal links should be in
[NTXXX]
style otherwise saving pages in a demo install will trigger validation errors on pagepart urls. Also some indentation fixes to cleanup the outputted fileBest viewed without whitespace changes: https://github.com/Kunstmaan/KunstmaanBundlesCMS/pull/2767/files?w=1