Fix tls close

[redboltz]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 97.31%. Comparing base (5b029eb) to head (58696ff).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...nc_mqtt/predefined_layer/customized_ssl_stream.hpp	70.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
+ Coverage   97.26%   97.31%   +0.05%     
==========================================
  Files         153      153              
  Lines        9474     9469       -5     
==========================================
  Hits         9215     9215              
+ Misses        259      254       -5     

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Files with missing lines	Coverage Δ
include/async_mqtt/impl/endpoint_close.hpp	98.48% <100.00%> (ø)
...nclude/async_mqtt/util/impl/stream_read_packet.hpp	98.55% <100.00%> (+<0.01%)	⬆️
...clude/async_mqtt/util/impl/stream_write_packet.hpp	97.19% <100.00%> (+0.02%)	⬆️
include/async_mqtt/util/ioc_queue.hpp	100.00% <100.00%> (ø)
...nc_mqtt/predefined_layer/customized_ssl_stream.hpp	82.35% <70.00%> (+7.93%)	⬆️

[redboltz]

Unified the point of self.complete() call. It fixes other close issue.
No regressions are detected #353