Fix: Inverted conditional logic for panel orientation for self_handle_up()

[hiunnhue]

This should fix #284.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.69%. Comparing base (42237ce) to head (11f2def).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   82.84%   82.69%   -0.16%     
==========================================
  Files          15       15              
  Lines        1924     1924              
  Branches      243      243              
==========================================
- Hits         1594     1591       -3     
- Misses        325      328       +3     
  Partials        5        5              

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