test(edgesec): fix `test_edgesec()` config memory leak

[aloisklink]

Some of the values in config were allocated on the heap by load_app_config():

https://github.com/nqminds/edgesec/blob/cbd6701393d7cd5ff3b134fb46056f206e2704b9/tests/test_edgesec.c#L350

Because of that, we must call free_app_config() to deallocate this variables.

---

Should we document this in the load_app_config() documentation?

https://github.com/nqminds/edgesec/blob/429d6179ec00553fe1959c105fb6dcb9a3ea4018/src/config.h#L86

[codecov[bot]]

Codecov Report

Merging #518 (7424a64) into main (e948bda) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #518      +/-   ##
==========================================
+ Coverage   53.54%   53.56%   +0.02%     
==========================================
  Files         144      144              
  Lines       20011    20020       +9     
==========================================
+ Hits        10714    10723       +9     
  Misses       9297     9297              

Impacted Files	Coverage Δ
tests/test_edgesec.c	97.86% <100.00%> (+0.01%)	:arrow_up:

... and 2 files with indirect coverage changes

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[mereacre]

Yes, definitely.