Rename OpenIds => OpenId.

Change-Id: I5d6f1764b07a56a22c883a566e31d2af0abc5736
diff --git a/src/main/java/eu/mulk/mulkcms2/benki/users/User.java b/src/main/java/eu/mulk/mulkcms2/benki/users/User.java
index 6e16903..45e775c 100644
--- a/src/main/java/eu/mulk/mulkcms2/benki/users/User.java
+++ b/src/main/java/eu/mulk/mulkcms2/benki/users/User.java
@@ -53,7 +53,7 @@
   public Collection<LazychatMessage> lazychatMessages;
 
   @OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
-  public Collection<Openids> openids;
+  public Collection<OpenId> openids;
 
   @OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
   public Collection<PageKey> pageKeys;