Fix parameter change event (backport #310)

[mergify]

This is an automatic backport of pull request #310 done by Mergify.

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[codecov-commenter]

Codecov Report

Merging #311 (9b39b7d) into master (1c0ea5a) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
- Coverage   69.20%   69.13%   -0.08%     
==========================================
  Files          16       16              
  Lines        2715     2715              
  Branches      765      765              
==========================================
- Hits         1879     1877       -2     
- Misses        450      451       +1     
- Partials      386      387       +1     

Impacted Files	Coverage Δ
...lc_parameter/src/rclc_parameter/parameter_server.c	82.41% <100.00%> (ø)
rclc/src/rclc/action_goal_handle.c	59.87% <0.00%> (-1.28%)	⬇️

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