Fix TaskDoc.from_directory when dir_name != "."

[esoteric-ephemera]

Minor bug with TaskDoc construction when TaskDoc.from_directory is called on a directory other than "." (dir_name arg).

In emmet.core.tasks._find_vasp_files, output files with the leading path are returned. When these files are fed to emmet.core.vasp.Calculation.from_vasp_files(...) (for example), dir_name will appear twice.

Ex: _find_vasp_files returns <dir_name>/OUTCAR, which Calculation.from_vasp_files turns into <dir_name>/<dir_name>/OUTCAR

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ebbe8d5) 91.36% compared to head (caead33) 91.36%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #873   +/-   ##
=======================================
  Coverage   91.36%   91.36%           
=======================================
  Files         138      138           
  Lines       12748    12749    +1     
=======================================
+ Hits        11647    11648    +1     
  Misses       1101     1101           

Files	Coverage Δ
emmet-core/emmet/core/tasks.py	87.27% <83.33%> (+0.03%)	⬆️

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