Setting UwframeSession to use fullName as display name if displayName is null....

Setting UwframeSession to use fullName as display name if displayName is null. Previously always used fullName, but recent commit set it to always use displayName. This commit splits the difference.

uw-spring-security-web/src/main/java/edu/wisc/uwss/web/uwframe/UwframeSession.java

@@ -60,7 +60,8 @@ public class UwframeSession {
    * @param userDetails
    */
   public UwframeSession(Environment environment, UWUserDetails userDetails) {
-    this(environment, userDetails.getUsername(), userDetails.getDisplayName(), userDetails.getFirstName(), userDetails.getLastName());
+    this(environment, userDetails.getUsername(), userDetails.getDisplayName()!=null ? userDetails.getDisplayName() : userDetails.getFullName(),
+            userDetails.getFirstName(), userDetails.getLastName());
   }
   /**
    *