tests: fixed random fails in RadiateTest (wrong MOR predicate code, #9550)

Mage/src/main/java/mage/MageObject.java

@@ -36,6 +36,11 @@ public interface MageObject extends MageItem, Serializable, Copyable<MageObject>
 
     String getName();
 
+    /**
+     * Warning, don't use it as a key - multiple objects can have same parts of the id in rare use cases
+     *
+     * @return
+     */
     String getIdName();
 
     String getLogName();