fix: typo use thread_priority (backport #1844)

[mergify]

Fixed typo with the logs with the thread priority usage. Use the user set parameter thread priority rather than default kSchedPriority. If user doesn't set the thread_priority it will be defaulted to the kSchedPriority.

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This is an automatic backport of pull request #1844 done by Mergify.

[mergify]

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	both modified:   controller_manager/src/ros2_control_node.cpp

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.35%. Comparing base (8ba9a49) to head (7718650).
Report is 1 commits behind head on iron.

Additional details and impacted files

@@           Coverage Diff           @@
##             iron    #1846   +/-   ##
=======================================
  Coverage   62.35%   62.35%           
=======================================
  Files         112      112           
  Lines       13098    13098           
  Branches     8879     8879           
=======================================
  Hits         8167     8167           
- Misses        948      949    +1     
+ Partials     3983     3982    -1     

Flag	Coverage Δ
unittests	62.35% <ø> (ø)

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Files with missing lines	Coverage Δ
controller_manager/src/ros2_control_node.cpp	80.00% <ø> (ø)

... and 1 file with indirect coverage changes