Setting the validator triggers the field's `valid` property notification, which triggers the group to refresh its validity, which fetches the `valid` property and runs the validator.
But the validator depends on the account field which hasn't been created yet, which causes a type-check warning.
So set the validator after all fields are made, and also change the data argument so the dependency is clearer.
Testing Done:
Compiled, and opened the New IM dialog.
Reviewed at https://reviews.imfreedom.org/r/2358/
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