Remove deprecation warning when parameter without value is set.

[destogl]

Without this change newest Rolling gives the following warning:

[publisher_joint_trajectory_controller-1] /opt/ros/rolling/local/lib/python3.10/dist-packages/rclpy/node.py:462: UserWarning: when declaring parameter named 'pos4', declaring a parameter only providing its name is deprecated. You have to either:
[publisher_joint_trajectory_controller-1]       - Pass a name and a default value different to "PARAMETER NOT SET" (and optionally a descriptor).
[publisher_joint_trajectory_controller-1]       - Pass a name and a parameter type.
[publisher_joint_trajectory_controller-1]       - Pass a name and a descriptor with `dynamic_typing=True

[codecov-commenter]

Codecov Report

Merging #445 (bd79979) into master (e7f9962) will decrease coverage by 5.79%.
The diff coverage is 20.65%.

@@            Coverage Diff             @@
##           master     #445      +/-   ##
==========================================
- Coverage   35.78%   29.98%   -5.80%     
==========================================
  Files         189        7     -182     
  Lines       17570      737   -16833     
  Branches    11592      422   -11170     
==========================================
- Hits         6287      221    -6066     
+ Misses        994      161     -833     
+ Partials    10289      355    -9934     

Flag	Coverage Δ
unittests	29.98% <20.65%> (-5.80%)	⬇️

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Impacted Files	Coverage Δ
...de/diff_drive_controller/diff_drive_controller.hpp	100.00% <ø> (ø)
...ontroller/test/test_load_diff_drive_controller.cpp	12.50% <0.00%> (ø)
diff_drive_controller/src/odometry.cpp	42.16% <11.11%> (ø)
...ive_controller/test/test_diff_drive_controller.cpp	17.62% <12.08%> (ø)
diff_drive_controller/src/speed_limiter.cpp	46.55% <13.33%> (ø)
...troller/include/diff_drive_controller/odometry.hpp	20.00% <20.00%> (ø)
...iff_drive_controller/src/diff_drive_controller.cpp	32.67% <24.89%> (ø)
...test/test_load_joint_group_velocity_controller.cpp
...jectory_controller/joint_trajectory_controller.hpp
...int_trajectory_controller/test/test_trajectory.cpp
... and 192 more