[rviz_rendering] Unnecessary information in ogre log messages

[greimela-si]

Ogre logs are redirected using rviz_rendering::ogre_rendering.cpp.

Currently, every log output generated by this class also includes the path to the ogre_rendering.cpp class.
Example:

[rviz_common:info] Creating resource group General, at /home/greimela/projects/ros2/rviz2_ws/src/aos-rviz2-public/rviz_rendering/src/rviz_rendering/ogre_logging.cpp:80
[rviz_common:info] Creating resource group OgreInternal, at /home/greimela/projects/ros2/rviz2_ws/src/aos-rviz2-public/rviz_rendering/src/rviz_rendering/ogre_logging.cpp:80
[rviz_common:info] Creating resource group OgreAutodetect, at /home/greimela/projects/ros2/rviz2_ws/src/aos-rviz2-public/rviz_rendering/src/rviz_rendering/ogre_logging.cpp:80
...

As far as I can tell Ogre does not provide information such as file name or line number in the Ogre::LogListener.
So we should just remove the path from the log message in this case.

[wjwwood]

Yeah, unfortunately the logging API I setup doesn't allow you to not specify the file and line number. I don't think we want to just exclude it because other instances of the log messages have meaningful files and line numbers in them, it's only the Ogre ones that don't and the ogre log messages which are being piped through this API don't provide the original file and line number.