update example data-channels-flow-control

[zhao-gang]

Skip buffer full send error to continue the loop.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.10%. Comparing base (b899593) to head (e2ae8a2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...hannels-flow-control/data-channels-flow-control.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #783      +/-   ##
==========================================
+ Coverage   45.01%   45.10%   +0.09%     
==========================================
  Files          46       46              
  Lines        9495     9497       +2     
==========================================
+ Hits         4274     4284      +10     
+ Misses       5221     5213       -8     

Flag	Coverage Δ
smol	44.99% <0.00%> (+0.03%)	⬆️
tokio	44.99% <0.00%> (-0.06%)	⬇️

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