fix: inverted precision/recall confusion matrices

[CharlesGaydon]

What does this PR do?

The labels "precision" and "recall" are I think inverted. The precision CM should be the one normalized by column: looking at the diagonal value gives the precision i.e. the % of predicted class that is from the actual class.

No tests needed since this is a smal small change I guess.

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[drprojects]

Hi @CharlesGaydon thanks for this draft. I am currently out of office, will look into this when I come back.

[drprojects]

Hi this PR has stayed as a draft for a while now, so I am closing it. Feel free to re-open it with a final version if need be.