fix: determine if a checkconfig refers to a library check based on whether it has an evaluationUrl.

Author: Justin-MacIntosh

builder-api/src/main/java/org/acme/controller/DecisionResource.java

@@ -240,7 +240,6 @@ private boolean isUserAuthorizedToAccessScreenerByScreener(String userId, Screen
     }
 
     private boolean isLibraryCheck(CheckConfig checkConfig){
-        Character libraryCheckPrefix = 'L';
-        return libraryCheckPrefix.equals(checkConfig.getCheckId().charAt(0));
+        return checkConfig.getEvaluationUrl() != null && !checkConfig.getEvaluationUrl().isBlank();
     }
 }