JS backend: use FqNameUnsafe when generate delegateName to avoid problems with special names.

#EA-64029 Fixed

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/DelegationTest.java

@@ -95,4 +95,8 @@ public class DelegationTest extends SingleFileTranslationTest {
     public void testDelegationExtensionPropertyDelegated() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testOnObject() throws Exception {
+        checkFooBoxIsOk();
+    }
 }