chore: clippy

frontend/appflowy_flutter/lib/user/application/auth/backend_auth_service.dart

@@ -70,7 +70,6 @@ class BackendAuthService implements AuthService {
       ..name = LocaleKeys.defaultUsername.tr()
       ..email = userEmail
       ..password = password
-      ..isAnon = true
       // When sign up as guest, the auth type is always local.
       ..authType = AuthenticatorPB.Local
       ..deviceId = await getDeviceId();

frontend/rust-lib/flowy-user-pub/src/entities.rs

@@ -42,7 +42,6 @@ pub struct SignUpParams {
   pub password: String,
   pub auth_type: Authenticator,
   pub device_id: String,
-  pub is_anon: bool,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone)]

frontend/rust-lib/flowy-user/src/entities/auth.rs

@@ -57,9 +57,6 @@ pub struct SignUpPayloadPB {
 
   #[pb(index = 5)]
   pub device_id: String,
-
-  #[pb(index = 6)]
-  pub is_anon: bool,
 }
 
 impl TryInto<SignUpParams> for SignUpPayloadPB {
@@ -76,7 +73,6 @@ impl TryInto<SignUpParams> for SignUpPayloadPB {
       password: password.0,
       auth_type: self.auth_type.into(),
       device_id: self.device_id,
-      is_anon: self.is_anon,
     })
   }
 }