Updated pgfplotsx.jl to use correct variable names

[JamieMair]

Should fix #4347

[BeastyBlacksmith]

Would you mind adding a test for that?

[t-bltg]

Thanks for fixing, I probably induced this.
Should be covered indeed by a test in test/test_pgfplotsx.jl.

[codecov]

Codecov Report

Base: 80.98% // Head: 80.98% // No change to project coverage 👍

Coverage data is based on head (a83e4bc) compared to base (610c384).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head a83e4bc differs from pull request most recent head ecebe4b. Consider uploading reports for the commit ecebe4b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4348   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files          28       28           
  Lines        7340     7340           
=======================================
  Hits         5944     5944           
  Misses       1396     1396           

Impacted Files	Coverage Δ
src/backends/pgfplotsx.jl	76.22% <0.00%> (ø)

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[JamieMair]

Would you mind adding a test for that?

Should be added now. Not the best test, but fails without the fix.

[BeastyBlacksmith]

Thanks! You might want to checkout #3503