Rename img metrics normalized

[Borda]

What does this PR do?

addresses #1246 (comment)

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[justusschock]

TBH, I'd prefer to keep it the current way. It is not a True/False in most of the cases but rather specifies which mechanism to use for normalization. In this context normalize as a verb makes more sense to me than an adjective (normalized). Also these changes would be breaking for no real reason.

[Borda]

In this context normalize as a verb makes more sense to me than an adjective (normalized)

for me, the normalize imply that the normalization will be done in the metric... 🐰

[SkafteNicki]

@Borda is this still needed?

[Borda]

@Borda is this still needed?

Was just writing the differences and realized that it is not... 🦦