refactor(middlewares): fix const stype difference

[aloisklink]

ltype was made const in commit 6693778 but some middlewares missed the change.

Fixes: 6693778

[codecov]

Codecov Report

Merging #280 (5f70e74) into main (12a396b) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 5f70e74 differs from pull request most recent head 645e4c7. Consider uploading reports for the commit 645e4c7 to get more accurate results

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
- Coverage   49.04%   49.00%   -0.04%     
==========================================
  Files         116      116              
  Lines       18495    18487       -8     
==========================================
- Hits         9070     9060      -10     
- Misses       9425     9427       +2     

Impacted Files	Coverage Δ
...iddlewares/cleaner_middleware/cleaner_middleware.c	14.70% <0.00%> (ø)
...ture/middlewares/pcap_middleware/pcap_middleware.c	23.18% <0.00%> (ø)
tests/utils/test_os.c	97.59% <0.00%> (-0.65%)	⬇️

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[mereacre]

Great