`find-fix-paths` does not uniq result

[TobiasNx]

inputFile
| open-file
| as-lines
| decode-pica
| find-fix-paths(".*DNB.*")
| print
;

007G.a	|	DNB
007G.a	|	DNB
047I.d	|	DNB

007G.a is a duplicate line. (See Playground) I would prefer if the results would be unique.

Expected would be then:

007G.a	|	DNB
047I.d	|	DNB

The flux-command find-fix-paths is based on:

| flatten
| stream-to-triples
| filter-triples(objectPattern=".*DNB.*")
| template("${p} | ${o}")

This can create duplicate results, if the pattern appears in multiple records and in the same elements with the same fix paths.
Therefore I suggest that we should add a sort-triples and a filter-duplicate-objects

| stream-to-triples
| filter-triples(objectPattern=".*DNB.*")
| sort-triples(by="Predicate")
| template("${p} | ${o}")
| filter-duplicate-objects

See Playground for the expected result.

[TobiasNx]

Can you help me with the tests at #687 ?