Update pre-dev.js

packages/tldraw/scripts/pre-dev.js

@@ -22,12 +22,6 @@ async function main() {
     tsconfig: './tsconfig.build.json',
     external: ['react', 'react-dom'],
   })
-
-  var files = fs.readdirSync('src/assets')
-
-  for (var i = 0; i < files.length; i++) {
-    fs.copyFileSync(path.join('src/assets', files[i]), path.join('dist', files[i]))
-  }
 }
 
 main()