Lambda --> reference: correct handling of parameter-less function

Issue #KT-15556 Fixed

idea/testData/intentions/convertLambdaToReference/nestedLambdaWithReceiver.kt.after

@@ -0,0 +1,9 @@
+// IS_APPLICABLE: true
+// WITH_RUNTIME
+
+fun foo() {
+    listOf(1).forEach { run(it::bar) }
+}
+
+fun Int.bar() {
+}