Fix decompiled text for named companion object

Fix stub/ast mismatch for compiled named companion objects
Add tests

idea/testData/decompiler/decompiledText/ClassWithNamedClassObject/ClassWithNamedClassObject.kt

@@ -0,0 +1,8 @@
+package test
+
+class ClassWithNamedClassObject {
+    companion object Named {
+        fun a() {
+        }
+    }
+}