Update test data for various tests

Due to slight semantic changes after class object refactor

idea/testData/checker/ClassObjects.kt

@@ -4,7 +4,7 @@ class A {
   class object {
     val x = 1
   }
-  <error descr="[MANY_CLASS_OBJECTS] Only one class object is allowed per class">class object</error> { // error
+  <error descr="[MANY_CLASS_OBJECTS] Only one class object is allowed per class">class object Another</error> { // error
     val x = 1
   }
 }

idea/testData/checker/duplicateJvmSignature/fields/classObjectCopiedFieldObject.kt

@@ -1,7 +1,7 @@
 class C {
     <error>class object</error> {
-        <error>val `OBJECT$`</error> = this
+        val <error>Default</error> = this
     }
 
-    val `OBJECT$` = C
+    val <error>Default</error> = C
 }