Fix CLC manifest when custom RuntimeDir is used

[vboulineau]

What does this PR do?

Currently CLC are broken when Security Agent is activated and policiesDir option is used.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Describe your test plan

Create DatadogAgent with CLC and custom security policies:

        runtime:
          enabled: true
          policiesDir:
            configMapName: security-runtime-policies

[codecov-commenter]

Codecov Report

Merging #318 (1eec235) into main (f95658e) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
+ Coverage   58.37%   58.41%   +0.03%     
==========================================
  Files          60       60              
  Lines        6355     6361       +6     
==========================================
+ Hits         3710     3716       +6     
  Misses       2370     2370              
  Partials      275      275              

Flag	Coverage Δ
unittests	58.41% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
controllers/datadogagent/clusterchecksrunner.go	76.20% <100.00%> (+0.41%)	⬆️

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