Bug in @default_metadata leads to wrong load_path in some namespaces

[ablaom]

MLJModelInterface.load_path needs to return the same string irrespective of namespace:

using MLJModelInterface

import OutlierDetectionNeighbors as ODN
julia> load_path(ODN.COFDetector)
"OutlierDetectionNeighbors.COFDetector"          # <-----------  correct

using OutlierDetectionNeighbors
julia> load_path(ODN.COFDetector)
"COFDetector"                # <--------- wrong

The bug is here