Allow PRW auto-configuration if campaign specified

Oliver Majerskyrequested to merge
omajersk/athena:PRW-CPalgo-update into master

This MR fixes two minor issues with PRW configuration in CP algos:

  1. If one pre-defines the campaign, it is not actually possible to get the default PRW config unless an input file is passed (i.e. self.files is not None).
  2. getConfigurationFiles needs to have the dataType passed, such that it can correctly ignore PRW files determination for data.

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