BUGFIX: Fix whitening procedure

Currently the attribute interferometer.whitened_frequency_domain_strain does not return strain with unit variance. This MR fixes this attribute and the ensuing plotting methods of the CBCResult object where it was called so that those plot the whitened time-domain strain with unit variance. Should I add a unit test that the interferometer.whitened_frequency_domain_strain actually returns unit-variance strain?

requested review from @colm.talbot

mentioned in merge request bilby_pipe!510 (merged)

changed title from Fix whitening procedure to BUGFUX: Fix whitening procedure

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changed milestone to %1.4.2

changed title from BUGFUX: Fix whitening procedure to BUGFIX: Fix whitening procedure

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• 20e70fe7 - Add unit test
• 3ebdff80 - Update unit test

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requested review from @michael.williams

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merged

mentioned in commit ee78d544