fix(identity): remove default for syncSource

To make the create method more consistent with the
guidelines,
this commit removes the default value from the `syncSource` parameter.

An Identity will be created as sync source,
when the associated account is created using an external provider.

Signed-off-by: David Mehren <git@herrmehren.de>

src/identity/identity.entity.ts

@@ -100,7 +100,7 @@ export class Identity {
   public static create(
     user: User,
     providerType: ProviderType,
-    syncSource = false,
+    syncSource: boolean,
   ): Omit<Identity, 'id' | 'createdAt' | 'updatedAt'> {
     const newIdentity = new Identity();
     newIdentity.user = user;