Revert "updated ICO to use a new layer with Canada's range weighted COSEWIC extinction risk status values. Note that the range weights and COSEWIC status weights should be updated to real values (see inst/extdata/layers_Canada-CHONe2014.R). Then the scores should be calculated again using the OHI app."

This reverts commit c651657db3e42f4afe7f986b095f6a73effdc712.