KT-6877 Wrong unused function inspection on anonymous object member

#KT-6877 fixed

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInClass.0.kt

@@ -0,0 +1,12 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages
+class Foo {
+    private val localObject = object : Any() {
+        fun <caret>f() {
+        }
+    }
+
+    fun bar() {
+        localObject.f()
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInClass.results.txt

@@ -0,0 +1 @@
+Function call (10: 21) localObject.f()