Fixed #438.

[redboltz]

Removed unintentional copy requiment from some of async functions parameter.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.62%. Comparing base (2c3cacc) to head (9503d83).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
+ Coverage   96.46%   96.62%   +0.16%     
==========================================
  Files         182      182              
  Lines       10313    10008     -305     
==========================================
- Hits         9948     9670     -278     
+ Misses        365      338      -27     

Files with missing lines	Coverage Δ
include/async_mqtt/asio_bind/impl/client_auth.hpp	100.00% <100.00%> (ø)
...de/async_mqtt/asio_bind/impl/client_disconnect.hpp	97.87% <100.00%> (-0.25%)	⬇️
...clude/async_mqtt/asio_bind/impl/client_publish.hpp	97.87% <100.00%> (-0.25%)	⬇️
include/async_mqtt/asio_bind/impl/client_start.hpp	97.91% <100.00%> (-0.20%)	⬇️
...ude/async_mqtt/asio_bind/impl/client_subscribe.hpp	97.87% <100.00%> (-0.25%)	⬇️
...e/async_mqtt/asio_bind/impl/client_unsubscribe.hpp	97.87% <100.00%> (-0.25%)	⬇️
...t/asio_bind/impl/endpoint_underlying_handshake.hpp	100.00% <100.00%> (+2.08%)	⬆️

... and 56 files with indirect coverage changes

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