Introduce account document to user document

An account document is attached to a user document if an account of the
user is on the server. It may be missing if the user is on a remote server.

src/api/endpoints/mute/delete.ts

@@ -30,7 +30,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	}, {
 		fields: {
 			data: false,
-			profile: false
+			'account.profile': false
 		}
 	});