Fix multiple chainable controller activation bug (backport #1401)

[mergify]

This is an automatic backport of pull request #1401 done by Mergify.
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	both modified:   controller_manager/src/controller_manager.cpp
	both modified:   controller_manager/test/test_controller_manager_srvs.cpp

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[saikishor]

In principle, the following should fix it

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.86%. Comparing base (0aa7ce7) to head (ffdef2d).

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #1411      +/-   ##
==========================================
+ Coverage   75.76%   75.86%   +0.09%     
==========================================
  Files          41       41              
  Lines        3219     3224       +5     
  Branches     1834     1838       +4     
==========================================
+ Hits         2439     2446       +7     
+ Misses        415      414       -1     
+ Partials      365      364       -1     

Flag	Coverage Δ
unittests	75.86% <80.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
controller_manager/src/controller_manager.cpp	65.12% <80.00%> (+0.34%)	⬆️