Fix class object visibility check

ExpressionTypingContext now has a scope for visibility checking, which isn't
replaced on replaceScope()

compiler/testData/diagnostics/tests/enum/classObjectOfPrivateEnum.kt

@@ -0,0 +1,9 @@
+// FILE: 1.kt
+package a
+
+private enum class E { ENTRY }
+
+// FILE: 2.kt
+package b
+
+val e = a.<!INVISIBLE_MEMBER!>E<!>