Fix sloppy variable definition in rotatebox GUI

[GabrielBram]

No description provided.

[codecov]

Codecov Report

Merging #109 (a79609a) into master (890747f) will not change coverage.
The diff coverage is 0.00%.

❗ Current head a79609a differs from pull request most recent head b37deaa. Consider uploading reports for the commit b37deaa to get more accurate results

@@           Coverage Diff           @@
##           master     #109   +/-   ##
=======================================
  Coverage   84.82%   84.82%           
=======================================
  Files          68       68           
  Lines        2702     2702           
=======================================
  Hits         2292     2292           
  Misses        410      410           

Flag	Coverage Δ
unittests	84.82% <0.00%> (ø)

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Files Changed	Coverage Δ
carmm/build/adsorbate_placer_gui.py	0.00% <0.00%> (ø)