Fix overriding of install

[tylerjw]

This is related to:

• Fix overriding of install kinematics_interface#13
• Fix CMake install so overriding works ros2_control#926
• Fix overriding of install ros2_controllers#510

Here are the colcon docs on overriding: https://colcon.readthedocs.io/en/released/user/overriding-packages.html#how-to-make-it-easier-for-your-users-to-override

Here is the ament_cmake user guide: https://docs.ros.org/en/rolling/How-To-Guides/Ament-CMake-Documentation.html

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@1493315). Click here to learn what that means.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff            @@
##             master     #105   +/-   ##
=========================================
  Coverage          ?   46.05%           
=========================================
  Files             ?       12           
  Lines             ?      545           
  Branches          ?      284           
=========================================
  Hits              ?      251           
  Misses            ?       31           
  Partials          ?      263           

Flag	Coverage Δ
unittests	46.05% <0.00%> (?)

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

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.