Use full asset path as name of Zarr object

[jwodder]

See dandi/dandi-archive#897 (comment)

[codecov]

Codecov Report

Merging #912 (ee73478) into master (533eeb9) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #912      +/-   ##
==========================================
- Coverage   86.82%   86.79%   -0.03%     
==========================================
  Files          61       61              
  Lines        7424     7424              
==========================================
- Hits         6446     6444       -2     
- Misses        978      980       +2     

Flag	Coverage Δ
unittests	86.79% <ø> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
dandi/files.py	79.82% <ø> (ø)
dandi/download.py	86.96% <0.00%> (-0.35%)	⬇️

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[yarikoptic]

ok, let's see if that would help dandi-archive anyhow. Thank you @jwodder