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]

I believe, the following should fix here as well

[codecov]

Codecov Report

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

Project coverage is 75.52%. Comparing base (4415018) to head (9244b5d).

Additional details and impacted files

@@           Coverage Diff           @@
##             iron    #1412   +/-   ##
=======================================
  Coverage   75.51%   75.52%           
=======================================
  Files          42       42           
  Lines        3366     3371    +5     
  Branches     1939     1943    +4     
=======================================
+ Hits         2542     2546    +4     
- Misses        440      441    +1     
  Partials      384      384           

Flag	Coverage Δ
unittests	75.52% <80.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
controller_manager/src/controller_manager.cpp	68.46% <80.00%> (+0.05%)	⬆️