fix: expose global functions when they are wrapped with try/catch

[slawekkolodziej]

This PR modifies the snippet used to wrap scripts with functions exposed via 'globalFns.' Previous implementations did not work properly when functions were declared within a 'try/catch' block, for example:

<script type="text/partytown">
  try {
    function hello() {
      console.log('hello world!');
    }
  } catch (err) {}
</script>
<script type="text/partytown">
  if (hello) {
    hello();
  }
</script>

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Name	Status	Preview	Updated
partytown	✅ Ready (Inspect)	Visit Preview	Sep 2, 2022 at 5:58PM (UTC)

[adamdbradley]

Thanks!