Update showimage.cpp removing extra std::cerr outputs

[jmackay2]

Description

Right now when running this you get the following:

/# ros2 run image_tools showimage 
[INFO] [1777605547.094321809] [showimage]: Subscribing to topic 'image'
[INFO] [1777605547.203184824] [showimage]: Received image #camera_frame
Received image #camera_frame
[INFO] [1777605547.533933569] [showimage]: Received image #camera_frame
Received image #camera_frame
[INFO] [1777605547.538867302] [showimage]: Received image #camera_frame
Received image #camera_frame
[INFO] [1777605547.543719581] [showimage]: Received image #camera_frame
Received image #camera_frame
[INFO] [1777605547.548553095] [showimage]: Received image #camera_frame
Received image #camera_frame
[INFO] [1777605547.553280199] [showimage]: Received image #camera_frame
Received image #camera_frame

The std::cerr message is redundant and doesn't actually display any additional helpful information. I propose we remove it since it doesn't seem to serve a purpose.

Is this user-facing behavior change?

This just changes the terminal output when running showImage.

Did you use Generative AI?

No.

[ahcorde]

can you retarget to rolling? then we can backport this to other distros

[fujitatomoya]

fix looks good to me. and probably we can backport this to downstream distros.

[jmackay2]

can you retarget to rolling? then we can backport this to other distros

Thanks for pointing this out. Done.

[fujitatomoya]

Pulls: #785
Gist: https://gist.githubusercontent.com/fujitatomoya/15c287a66258db9f4b3852d33906b0ee/raw/ff7ff333ed1c3104fff788c70a0b5fe86463aef6/ros2.repos
BUILD args: --packages-up-to image_tools
TEST args: --packages-select image_tools
ROS Distro: rolling
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/19105

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