fix: remove test cruft

uw-spring-security-core/src/test/java/edu/wisc/uwss/local/LocalUserDetailsManagerImplTest.java

@@ -283,7 +283,6 @@ public class LocalUserDetailsManagerImplTest {
    */
   @Test
   public void loadUserByUsername_with_callback() {
-    boolean visited = false;
     LocalUserDetailsManagerImpl manager = new LocalUserDetailsManagerImpl();
     // setup a simple callback to mutate the userDetails
     LocalUsersAuthenticationAttemptCallback callback = new LocalUsersAuthenticationAttemptCallback<UWUserDetailsImpl>() {