Add missing quotes around "file" fieldtype

[jamesr2323]

Two recently added fields for the AdAccount object had the fieldtype specified as file, instead of 'file', causing an error on first initializing the AdAccount, and many of the methods to function incorrectly. This PR adds the quotes, fixing the functionality.

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[alanho]

@jamesr2323 thanks for the PR. this issue has been fixed internally at the upstream codegen process. so closing this