rtph264: fix decode error

[aler9]

Intact NALUs received after corrupted NALUs were wrongly discarded.

[codecov-commenter]

Codecov Report

Merging #150 (09e5010) into main (d75423d) will increase coverage by 0.03%.
The diff coverage is 90.82%.

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
+ Coverage   82.32%   82.35%   +0.03%     
==========================================
  Files          70       70              
  Lines        7066     7062       -4     
==========================================
- Hits         5817     5816       -1     
  Misses        844      844              
+ Partials      405      402       -3     

Impacted Files	Coverage Δ
pkg/rtph264/encoder.go	96.82% <ø> (ø)
serversession.go	80.13% <60.00%> (+0.05%)	⬆️
client.go	76.88% <86.66%> (+0.11%)	⬆️
clientudpl.go	82.91% <88.88%> (+0.67%)	⬆️
pkg/rtph264/decoder.go	74.50% <92.18%> (-0.70%)	⬇️
pkg/bytecounter/bytecounter.go	100.00% <100.00%> (ø)
serverconn.go	88.26% <100.00%> (-0.59%)	⬇️
serverudpl.go	87.03% <100.00%> (ø)

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