dandi move: Fix resolution of nonexistent dests when in a subdirectory

[jwodder]

Fixes #1057.

[codecov]

Codecov Report

Merging #1063 (de0c82d) into master (e4dc875) will increase coverage by 0.06%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master    #1063      +/-   ##
==========================================
+ Coverage   88.35%   88.42%   +0.06%     
==========================================
  Files          72       72              
  Lines        9250     9258       +8     
==========================================
+ Hits         8173     8186      +13     
+ Misses       1077     1072       -5     

Flag	Coverage Δ
unittests	88.42% <84.61%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
dandi/move.py	91.54% <66.66%> (+0.02%)	⬆️
dandi/tests/test_move.py	100.00% <100.00%> (ø)
dandi/_version.py	45.96% <0.00%> (+1.75%)	⬆️

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[yarikoptic]

Didn't test but the added unittest seems to test exactly what is needed, so let's proceed. Thank you @jwodder . Let's release with this

[github-actions]

🚀 PR was released in 0.45.1 🚀