Rename the executable from slocker_lite to slocker-lite

Matches the project name and the slocker-lite-priv-drop helper's own
naming convention.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gv3s5jckJKzh6JkMoi2Akz

meson.build

@@ -16,7 +16,7 @@ conf_data.set10('ENABLE_TESTS', get_option('enable_tests'))
 
 configure_file(output : 'config.h', configuration : conf_data)
 
-slocker_lite = executable('slocker_lite',
+slocker_lite = executable('slocker-lite',
     ['src/main.cpp', 'src/process.cpp', 'src/oci_image.cpp', 'src/containers_storage.cpp',
      'src/bwrap.cpp', 'src/user_spec.cpp'],
     include_directories : include_directories('.'),