Revert "Hibernate warning fixes"

This reverts commit dd653cb525.

src/main/java/nl/connectedit/swiss/domain/entity/Match.java

@@ -30,11 +30,9 @@ public class Match extends AbstractEntity {
     private Round round;
 
     @ManyToOne
-    @JoinColumn(name = "team1_id")
     private Team team1;
 
     @ManyToOne
-    @JoinColumn(name = "team2_id")
     private Team team2;
 
     private Boolean played;