Identifying (GetFeatureInfo) on a WMS layer in the map only shows data in columns with a lowercase title.

[josegar74]

Fixes #8353.

Affects only 3.12.x branch. Follow up of #6802, that missed to lower the data row keys to unify the comparison with the column names from the GetFeaturesInfo response and the FeatureCatalogue metadata (when the dataset metadata has a FeatureCatalogue metadata associated).

See test case described in #8353.

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