Fixed JWT Role assignment and method access

src/main/java/com/faf223/expensetrackerfaf/security/PersonDetails.java

@@ -10,7 +10,7 @@ import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
 
 import java.util.Collection;
-import java.util.List;
+import java.util.Collections;
 
 @Data
 @Builder
@@ -22,7 +22,7 @@ public class PersonDetails implements UserDetails {
 
     @Override
     public Collection<? extends GrantedAuthority> getAuthorities() {
-        return List.of(new SimpleGrantedAuthority(credential.getRole().name()));
+        return Collections.singletonList(new SimpleGrantedAuthority(credential.getRole().toString()));
     }
 
     @Override