Fix bug for displaying all controllers (backport #1259)

[mergify]

Hi,

When using the rqt_joint_trajectory_controller, not all the controllers are shown on the controller button. This is because the list of limits was not accumulated, and only the last one was considered. This PR fixes this, showing all the valid controllers.

I hope it helps
Francisco

---

This is an automatic backport of pull request #1259 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 3be3fe9 has failed:

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	both modified:   rqt_joint_trajectory_controller/rqt_joint_trajectory_controller/joint_trajectory_controller.py

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[christophfroehlich]

Let's merge backport #1274 first

[mergify]

This pull request is in conflict. Could you fix it @bmagyar @destogl @christophfroehlich?

[bmagyar]

@Mergifyio rebase

[mergify]

rebase

☑️ Nothing to do

• -conflict [📌 rebase requirement]
• -closed [📌 rebase requirement]
• queue-position=-1 [📌 rebase requirement]
• any of:
  • #commits-behind>0 [📌 rebase requirement]
  • #commits>1 [📌 rebase requirement]
  • -linear-history [📌 rebase requirement]

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.22%. Comparing base (9e07ac5) to head (98c5ccb).
Report is 1 commits behind head on humble.

Files with missing lines	Patch %	Lines
...ajectory_controller/joint_trajectory_controller.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #1271      +/-   ##
==========================================
- Coverage   65.23%   65.22%   -0.02%     
==========================================
  Files         103      103              
  Lines       11435    11436       +1     
  Branches     7252     7253       +1     
==========================================
- Hits         7460     7459       -1     
- Misses       1476     1477       +1     
- Partials     2499     2500       +1     

Flag	Coverage Δ
unittests	65.22% <0.00%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
...ajectory_controller/joint_trajectory_controller.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes