Repeated filename in path qualifier for SWHIDs

The Permalinks box in the current webapp creates a path qualifier with a repeated filename. To replicate, go here: https://archive.softwareheritage.org/browse/revision/45a739c495934cc65b5e0d00254401d191eb2a58/?origin_url=https://github.com/rdicosmo/parmap&path=src/parmap.ml&snapshot_id=2ad4e6cab37cbb98f3063cd1928c837156c95438#L194-L228

and get the SWHID with context for the content:

swh:1:cnt:43a6b232768017b03da934ba22d9cc3f2726a6c5;origin=https://github.com/rdicosmo/parmap;visit=swh:1:snp:2ad4e6cab37cbb98f3063cd1928c837156c95438;anchor=swh:1:rev:526acc4d2dd0f8949dfd53fa1ff015307c970899;path=/src/parmap.mlparmap.ml;lines=194-228

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Migrated from T2408 (view on Phabricator)