Call setMetadataFiltered(true) for all Memoizer uses

The fact that OMEROWrapper was using setMetadataFilter(true)
but the PixelsService was not led to the equalReaders method
to return false which essentially deactivated Memoizer speed
ups for resetDefaultsInSet!
Merge pull request #2758 from joshmoore/memo-filtered-metadata

Call setMetadataFiltered(true) for all Memoizer uses