Cleanup PcapLiveDevice synchronous capture.

[Dimi1010]

Part of #1838

This PR updates the synchronous capture method.

[codecov]

Codecov Report

❌ Patch coverage is 69.09091% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.45%. Comparing base (24cc309) to head (dc91d05).

Files with missing lines	Patch %	Lines
Pcap++/src/PcapLiveDevice.cpp	69.09%	11 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2026      +/-   ##
==========================================
- Coverage   83.87%   83.45%   -0.43%     
==========================================
  Files         307      311       +4     
  Lines       53952    54584     +632     
  Branches    11352    11560     +208     
==========================================
+ Hits        45254    45551     +297     
- Misses       7483     7815     +332     
- Partials     1215     1218       +3     

Flag	Coverage Δ
alpine320	75.86% <50.00%> (-0.03%)	⬇️
fedora42	75.43% <50.00%> (-0.03%)	⬇️
macos-14	81.57% <62.22%> (-0.01%)	⬇️
macos-15	81.56% <62.22%> (-0.02%)	⬇️
mingw32	69.92% <40.62%> (-0.08%)	⬇️
mingw64	69.94% <50.00%> (+0.07%)	⬆️
npcap	?
rhel94	75.43% <51.42%> (-0.05%)	⬇️
ubuntu2004	59.47% <51.42%> (-0.01%)	⬇️
ubuntu2004-zstd	59.58% <51.42%> (+0.01%)	⬆️
ubuntu2204	75.37% <51.42%> (-0.03%)	⬇️
ubuntu2204-icpx	57.85% <55.55%> (+<0.01%)	⬆️
ubuntu2404	75.49% <51.42%> (+<0.01%)	⬆️
ubuntu2404-arm64	75.53% <50.00%> (-0.01%)	⬇️
unittest	83.45% <69.09%> (-0.43%)	⬇️
windows-2022	85.37% <66.66%> (+0.12%)	⬆️
windows-2025	85.40% <68.29%> (+0.07%)	⬆️
winpcap	85.40% <68.29%> (-0.12%)	⬇️
xdp	52.97% <0.00%> (?)

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