Fixing compilation failure when visp_gui is deactivated

[rolalaro]

[FIX] Fixed compilation problem of visp_modules when visp_gui is deactivated

This MR aims to fix #1892

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.58%. Comparing base (b7b806c) to head (b3e6262).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1893      +/-   ##
==========================================
- Coverage   48.62%   48.58%   -0.04%     
==========================================
  Files         532      532              
  Lines       69293    69293              
  Branches    32402    32402              
==========================================
- Hits        33691    33669      -22     
- Misses      31477    31481       +4     
- Partials     4125     4143      +18     

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