fixed INACCESSIBLE_OUTER_CLASS_EXPRESSION check

for extension lambda (with implicit this) in nested class

compiler/testData/diagnostics/tests/inner/extensionLambdaInsideNestedClass.kt

@@ -0,0 +1,27 @@
+package f
+
+object A {
+    class LoginFormPage() : Request({
+        val failed = session.get("LOGIN_FAILED")
+    })
+}
+
+class B {
+    class object {
+        class LoginFormPage() : Request({
+            val failed = session.get("LOGIN_FAILED")
+        })
+    }
+
+    class C {
+        class LoginFormPage() : Request({
+            val failed = session.get("LOGIN_FAILED")
+        })
+    }
+}
+
+open class Request(private val handler: ActionContext.() -> Unit) {}
+
+trait ActionContext {
+    val session : Map<String, String>
+}