update sample to use new Backlink code generator

Author: Christian

Example/NotesExample-iOS/NotesOverviewViewController.swift

@@ -23,7 +23,7 @@ class NotesOverviewViewController: UITableViewController {
             self.authorId = authorId
 
             if let authorId = authorId {
-                query = noteBox.query { Note.authorId == authorId }
+                query = noteBox.query { Note.author == authorId }
             } else {
                 query = noteBox.query()
             }

Example/Shared/Author.swift

@@ -6,7 +6,8 @@ import ObjectBox
 class Author {
     var id: Id<Author> // An `Id<Author>` is required by ObjectBox
     var name: String
-    var notes: ToMany<Note, Author> // Backlinks
+    // sourcery: backlink = "author"
+    var notes: ToMany<Note, Author>
 
     // An initializer with no parameters is required by ObjectBox
     required init() {