fix script source name

Author: brachy84

src/main/java/com/cleanroommc/groovyscript/sandbox/GroovySandbox.java

@@ -174,7 +174,7 @@ protected void loadClassScripts(GroovyScriptEngine engine, Binding binding, Set<
     }
 
     protected void runScript(Script script){
-        setCurrentScript(script.toString());
+        setCurrentScript(script.getClass().getName());
         script.run();
         setCurrentScript(null);
     }