[backend] Fix on count in atomic testing search

[Dimfacion]

Proposed changes

• Small change to fix the count in atomic testing

Related issues

• issue The pagination doesn't work #1167

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 26.17%. Comparing base (bb9aeb6) to head (b7843d9).

Files	Patch %	Lines
.../java/io/openbas/service/AtomicTestingService.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1168      +/-   ##
============================================
+ Coverage     25.90%   26.17%   +0.27%     
- Complexity     1062     1066       +4     
============================================
  Files           481      481              
  Lines         11602    11602              
  Branches        609      609              
============================================
+ Hits           3005     3037      +32     
+ Misses         8512     8480      -32     
  Partials         85       85              

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