Fix bug with pbkdf2 expression of salt parameter.

[dlongley]

No description provided.

[davidlehn]

Would be good to add a short test to avoid future regressions for this. But that requires exposing the internal functions, so maybe not worth it here.

[davidlehn]

Needs codecov token in the workflow.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.95%. Comparing base (62ddebd) to head (52d29d8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   55.95%   55.95%           
=======================================
  Files           3        3           
  Lines         168      168           
=======================================
  Hits           94       94           
  Misses         74       74           

Files with missing lines	Coverage Δ
lib/pbkdf2.js	50.81% <100.00%> (ø)

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