[backend/frontend] Fix duplicate inject results

[RomuDeuxfois]

Proposed changes

• Fix duplicate inject results on Mitre Matrix

Linked issues

• https://github.com/OpenBAS-Platform/openbas/issues/944

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.18%. Comparing base (3366c8a) to head (a37cb4c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1074      +/-   ##
============================================
- Coverage     25.60%   25.18%   -0.43%     
+ Complexity     1014     1012       -2     
============================================
  Files           464      464              
  Lines         10877    10944      +67     
  Branches        532      550      +18     
============================================
- Hits           2785     2756      -29     
- Misses         8026     8122      +96     
  Partials         66       66              

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