lith/deploy.fish: keep sharp's optional native bindings
\`--omit=optional\` was stripping sharp's platform-specific native
binaries (Linux x64 libs live in sharp's optionalDependencies), so
bundler.mjs crashed on the server when the amxd build step ran.
Removing that flag. Keeping PUPPETEER_SKIP_DOWNLOAD=1 to avoid
pulling Chromium since the build-notepat path doesn't need it.