Fix resetting path in Dataset.download

[Cadair]

No description provided.

[codecov]

Codecov Report

Merging #124 (76e26d9) into main (1c3d7dc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files          23       23           
  Lines         972      972           
=======================================
  Hits          918      918           
  Misses         54       54           

Impacted Files	Coverage Δ
dkist/io/array_containers.py	91.47% <100.00%> (ø)

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