[humble] Fix typo to properly restore SIGINT handler

[EricCousineau-TRI]

• Closes [rosbag2_py] Typo in Recorder's signal restoration? (second SIGTERM should be SIGINT) #1686

[EricCousineau-TRI]

It appears that this typo is also present in iron, so I can retarget this PR + request backport, or we can forward port.
Please let me know which.

[MichaelOrlov]

LGTM

[fujitatomoya]

good eye 👁️ lgtm with green CI

[MichaelOrlov]

@EricCousineau-TRI While changes in this PR will certainly fix a typo and will properly return the original signal handler for SIGINT, but it will not solve a problem reported in the #1686.

Among properly returning original signal handlers need yet memorize the deferred signal in the static member variable and call the original SIGINT handler on exit. See https://github.com/ros2/rosbag2/pull/1685/files#diff-c85fd024e7d68c762d60d25e2ba155bcc527f04c937ed09adc893ea241fdc61cR241-R254 for reference.

Also, I would encourage you to cherry-pick my newly added test_process_sigint_in_recorder(tmp_path, storage_id, capfd): unit test from the #1685
https://github.com/ros2/rosbag2/pull/1685/files#diff-f990d34f689d7cde53ab226e2b1b96b5573c4e050ccf698cc182e76bd72fc0eeR88-R129
tio make sure tha the original Python SIGINT handler called.

[MichaelOrlov]

Pulls: #1687
Gist: https://gist.githubusercontent.com/MichaelOrlov/1b19779b38d132c8d347c6a3d4655481/raw/dc63ceb2b44ab11cb2cab457a6df42d697ad22dc/ros2.repos
BUILD args: --packages-above-and-dependencies ros2bag rosbag2_py
TEST args: --packages-above ros2bag rosbag2_py
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/14041

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