Make Rider <-> Preferences unidirectional

ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/Preferences.java

@@ -15,13 +15,9 @@ public class Preferences implements IPreferences {
     private Long id;
 
     @ElementCollection(fetch = FetchType.LAZY)
-    @OrderColumn
     @JoinTable(name = J_PREFERENCES_DATA)
     private Map<String, String> data = new HashMap<>();
 
-    @OneToOne(targetEntity = Rider.class, fetch = FetchType.LAZY)
-    private IRider rider;
-
     @Override
     public Long getId() {
         return id;