Arrow sizes not updating

[Jay-sanjay]

issue #4820 fixing
a tiny typo error for stealth to be capitalized.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6b00968) 90.29% compared to head (af09705) 90.29%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4821   +/-   ##
=======================================
  Coverage   90.29%   90.29%           
=======================================
  Files          40       40           
  Lines        8752     8752           
=======================================
  Hits         7903     7903           
  Misses        849      849           

Files Changed	Coverage Δ
src/backends/pgfplotsx.jl	88.13% <100.00%> (ø)

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