fix EXDEV error on cross-device move during fxlens update

[digitallyserviced]

update to copy, then rm instead of move since tmp is usually a separate mount and fs type on linux. other OS should remain unaffected

Error: EXDEV: cross-device link not permitted, rename '/tmp/fxhash-cli/build' -> '/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/static/fxlens'
    at Object.renameSync (node:fs:1042:3)
    at Object.update (/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/dist/chunk-73KLPOU4.js:183:18)
    at async /usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/dist/chunk-73KLPOU4.js:44:23
    at async Object.step (/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/dist/chunk-2YPNYSAB.js:101:19)
    at async /usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/dist/chunk-73KLPOU4.js:42:32
    at async Promise.all (index 0)
    at async updateToolkit (/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/dist/chunk-73KLPOU4.js:27:10)
    at async Object.handler (/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/dist/chunk-NBWEXRVY.js:98:7) {
  errno: -18,
  syscall: 'rename',
  code: 'EXDEV',
  path: '/tmp/fxhash-cli/build',
  dest: '/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/static/fxlens'
}
❗ EXDEV: cross-device link not permitted, rename '/tmp/fxhash-cli/build' -> '/usr/local/lib/node_modules/fxhash/node_modules/@fxhash/cli/static/fxlens'