Fix some bugs for the saving of WB outputs

Bryan Guillaume requested to merge fixOutputDofWB into master

The goal of this MR is to fix 2 bugs related to the WB image outputs:

  1. The effective number of degrees of freedom is now saved if requested by the user when the WB option with common design is used

  2. The raw F-score saved for WB is now the scaled version like the one saved for parametric tests.

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