Remove extra single quote in LdPreload debug log

[christophebedard]

This can be seen in the test output for test_tracetools_launch:

test/test_tracetools_launch/test_trace_action.py::TestTraceAction::test_action_ld_preload [DEBUG] [launch.launch_context]: emitting event synchronously: 'launch.events.IncludeLaunchDescription'
[INFO] [launch]: All log files can be found below /home/christophe.bedard/.ros/log/2023-08-30-14-54-14-398230-ul-pa-1255-1-1810625
[INFO] [launch]: Default logging verbosity is set to DEBUG
[DEBUG] [launch]: processing event: '<launch.events.include_launch_description.IncludeLaunchDescription object at 0x7f6fd7b98ee0>'
[DEBUG] [launch]: processing event: '<launch.events.include_launch_description.IncludeLaunchDescription object at 0x7f6fd7b98ee0>' ✓ '<launch.event_handlers.on_include_launch_description.OnIncludeLaunchDescription object at 0x7f6fd7b98be0>'
[DEBUG] [tracetools_launch.actions.ld_preload]: whereis command for 'liblttng-ust-libc-wrapper.so' exited with 0: liblttng-ust-libc-wrapper.so: /usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so
[DEBUG] [tracetools_launch.actions.ld_preload]: lib paths for 'liblttng-ust-libc-wrapper.so'': ['/usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so']
[DEBUG] [tracetools_launch.actions.ld_preload]: Shared library for 'liblttng-ust-libc-wrapper.so' found at: /usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so
[DEBUG] [tracetools_launch.actions.ld_preload]: whereis command for 'liblttng-ust-pthread-wrapper.so' exited with 0: liblttng-ust-pthread-wrapper.so: /usr/lib/x86_64-linux-gnu/liblttng-ust-pthread-wrapper.so
[DEBUG] [tracetools_launch.actions.ld_preload]: lib paths for 'liblttng-ust-pthread-wrapper.so'': ['/usr/lib/x86_64-linux-gnu/liblttng-ust-pthread-wrapper.so']
[DEBUG] [tracetools_launch.actions.ld_preload]: Shared library for 'liblttng-ust-pthread-wrapper.so' found at: /usr/lib/x86_64-linux-gnu/liblttng-ust-pthread-wrapper.so
[DEBUG] [tracetools_launch.actions.ld_preload]: whereis command for 'liblttng-ust-dl.so' exited with 0: liblttng-ust-dl.so: /usr/lib/x86_64-linux-gnu/liblttng-ust-dl.so
[DEBUG] [tracetools_launch.actions.ld_preload]: lib paths for 'liblttng-ust-dl.so'': ['/usr/lib/x86_64-linux-gnu/liblttng-ust-dl.so']
[DEBUG] [tracetools_launch.actions.ld_preload]: Shared library for 'liblttng-ust-dl.so' found at: /usr/lib/x86_64-linux-gnu/liblttng-ust-dl.so
[DEBUG] [tracetools_launch.actions.ld_preload]: whereis command for 'liblttng-ust-cyg-profile-fast.so' exited with 0: liblttng-ust-cyg-profile-fast.so: /usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile-fast.so
[DEBUG] [tracetools_launch.actions.ld_preload]: lib paths for 'liblttng-ust-cyg-profile-fast.so'': ['/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile-fast.so']
[DEBUG] [tracetools_launch.actions.ld_preload]: Shared library for 'liblttng-ust-cyg-profile-fast.so' found at: /usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile-fast.so

See: lib paths for 'liblttng-ust-dl.so''.

Also, update a nearby comment about possible files returned by whereis -b to mention .la files.

[christophebedard]

Testing packages above tracetools_launch:

• Linux
• Linux-aarch64
• Windows