Fix failure of prettier on unquoted fieldNames containing '-'

[nilshoffmann]

Prettier fails with a SyntaxError: ',' expected when it encounters an unquoted field name in the form control. Simply quoting all field names fixes the issue. Prettier then keeps or removes the quotes automatically, as needed.

[martinmcwhorter]

Thanks for this.

The prettier error is probably just a symptom of the problem.