Fix vpDetectorAprilTag configuration using JSON

[rolalaro]

Forgot to set the attribute m_tagFamily when loading configuration from a JSON file.

[codecov]

Codecov Report

❌ Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.36%. Comparing base (41a3fb2) to head (5fcc8a5).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
modules/detection/src/tag/vpDetectorAprilTag.cpp	33.33%	1 Missing and 3 partials ⚠️
...ction/include/visp3/detection/vpDetectorAprilTag.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1931      +/-   ##
==========================================
- Coverage   48.41%   48.36%   -0.06%     
==========================================
  Files         532      532              
  Lines       69328    69334       +6     
  Branches    32424    32440      +16     
==========================================
- Hits        33566    33530      -36     
- Misses      31515    31519       +4     
- Partials     4247     4285      +38     

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