Fix uiopen path change in R2024b causing recursion bug #215

[mducle]

The path to the uiopen function changed in Matlab R2024b so the old code to add drag-and-drop of CIF to SpinW was then causing a bug everytime users try to open a file from the file tree (inside Matlab). This PR fixes it.

To test:

Load SpinW in R2024b. Double click on an .m file in the left panel (Current Folder) and check that the Maximum recursion limit of 500 reached error does not occur.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 43.27%. Comparing base (ecfd2c9) to head (0181ae6).

Files with missing lines	Patch %	Lines
external/uiopen.m	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
- Coverage   43.29%   43.27%   -0.02%     
==========================================
  Files         243      243              
  Lines       16383    16389       +6     
==========================================
  Hits         7093     7093              
- Misses       9290     9296       +6     

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Test Results

    4 files  ±0    124 suites  ±0   6m 6s ⏱️ -9s
  831 tests ±0    813 ✅ ±0  18 💤 ±0  0 ❌ ±0 
2 324 runs  ±0  2 288 ✅ ±0  36 💤 ±0  0 ❌ ±0 

Results for commit 0181ae6. ± Comparison against base commit ecfd2c9.