made saved user auth remember original class if it gets re-used

Author: jricher

openid-connect-common/src/main/java/org/mitre/oauth2/model/SavedUserAuthentication.java

@@ -67,7 +67,13 @@ public SavedUserAuthentication(Authentication src) {
 setName(src.getName());
 setAuthorities(src.getAuthorities());
 setAuthenticated(src.isAuthenticated());
-setSourceClass(src.getClass().getName());
+
+if (src instanceof SavedUserAuthentication) {
+// if we're copying in a saved auth, carry over the original class name
+setSourceClass(((SavedUserAuthentication) src).getSourceClass());
+} else {
+setSourceClass(src.getClass().getName());
+}
 }
 
 /**