utils: use split loader into @hydrooj/register

packages/hydrojudge/bin/hydrojudge.js

@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 
 const argv = require('cac')().parse();
-require('@hydrooj/utils/lib/register');
+require('@hydrooj/register');
 
 if (argv.args[0] === 'cache') require('../src/cache')();
 else require('../src/daemon')();