[WEB] Can't run a transaction inside exclusively

[davidmartos96]

Describe the bug

I'm trying out the new exclusively feature and it seems to be failing on web when running a drift transaction inside a exclusively block.
On a VM environment it works correctly.

await db.exclusively(() async {
  await db.transaction(() async {
    ...
  });
});

[simolus3]

Thanks for the report! I've fixed this in drift version 2.19.1, you'll need a new worker though.