Don't check class object visibility when it's in qualifier position

(visibility for member is checked anyway).
It might be better to underline invisible qualifier in a chain (class or class object), not the last one (member) - for later improvement.

compiler/testData/diagnostics/tests/classObjects/ClassObjectVisibility.kt

@@ -3,8 +3,9 @@ package foo
 fun test() {
   A.d
   A.<!INVISIBLE_MEMBER!>f<!>
+  B.<!INVISIBLE_MEMBER!>D<!>
   <!INVISIBLE_MEMBER!>CCC<!>
-  <!INVISIBLE_MEMBER!>CCC<!>.<!INVISIBLE_MEMBER!>classObjectVar<!>
+  CCC.<!INVISIBLE_MEMBER!>classObjectVar<!>
 }
 
 class A() {
@@ -16,6 +17,12 @@ class A() {
   }
 }
 
+class B {
+    class D {
+        private class object
+    }
+}
+
 class CCC() {
   private class object {
     val classObjectVar = 3