fix --dep-graph, use all_dependencies EasyConfig class variable rather than 'dependencies' parameter

[boegel]

fix for bug introduced in #1356, see also easybuilders/easybuild-easyconfigs#1870

[boegel]

This needs a unit test to catch that bug...

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[boegel]

@wpoely86, @pforai, @rjeschmi: please review?

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[wpoely86]

looks fine

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[boegel]

Thanks for the review @wpoely86!