Fix udp del listener

[yellowhatter]

Based on udp_del_listener to prove that fix worked

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.21%. Comparing base (de1a072) to head (e6a6367).

Files with missing lines	Patch %	Lines
io/zenoh-transport/src/unicast/lowlatency/link.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           dev/udp_del_listener    #1893   +/-   ##
=====================================================
  Coverage                 71.20%   71.21%           
=====================================================
  Files                       365      365           
  Lines                     65585    65585           
=====================================================
+ Hits                      46702    46708    +6     
+ Misses                    18883    18877    -6     

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