Delete argument border from load_stylesheet()

[codecov[bot]]

Codecov Report

Merging #220 (eb2f8ab) into main (c67e371) will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
- Coverage   97.15%   97.12%   -0.03%     
==========================================
  Files          42       42              
  Lines        1512     1498      -14     
==========================================
- Hits         1469     1455      -14     
  Misses         43       43              

Impacted Files	Coverage Δ
qdarktheme/_style_loader.py	85.84% <ø> (-0.76%)	:arrow_down:
tests/test_qdarktheme.py	100.00% <ø> (ø)

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