KT-6566 Generate Override/Implement method does not work for locally declared classes

#KT-6566 Fixed

idea/testData/codeInsight/overrideImplement/localClass.kt

@@ -0,0 +1,11 @@
+abstract class C<A> {
+    abstract fun f(a: A)
+}
+
+fun f() {
+    class R
+
+    object : C<R> {
+        <caret>
+    }
+}

idea/testData/codeInsight/overrideImplement/localClass.kt.after

@@ -0,0 +1,13 @@
+abstract class C<A> {
+    abstract fun f(a: A)
+}
+
+fun f() {
+    class R
+
+    object : C<R> {
+        override fun f(a: R) {
+            <selection><caret>throw UnsupportedOperationException()</selection>
+        }
+    }
+}