Fixed KT-5341 Code completion of class declared locally inserts its "qualified name"

#KT-5341 Fixed

idea/testData/completion/handlers/NestedLocalClassCompletion.kt

@@ -0,0 +1,7 @@
+fun foo() {
+    class LocalClass {
+        inner class Nested {}
+
+        val v: <caret>
+    }
+}