[FIX] Fixed visp_java compilation when GUI module is deactivated

[rolalaro]

When the visp_gui module was deactivated, the visp_java compilation failed due to the initClick method of vpMbGenericTracker

Closes #1912

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.53%. Comparing base (b3e6262) to head (1b8ca8d).
⚠️ Report is 51 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (b3e6262) and HEAD (1b8ca8d). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (b3e6262)	HEAD (1b8ca8d)
	3	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1913       +/-   ##
===========================================
- Coverage   48.58%   33.53%   -15.05%     
===========================================
  Files         532      465       -67     
  Lines       69293    66321     -2972     
  Branches    32402    28884     -3518     
===========================================
- Hits        33669    22244    -11425     
- Misses      31481    33260     +1779     
- Partials     4143    10817     +6674     

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[fspindle]

@rolalaro Thanks