Convert lambda to reference: fix it works correctly for labeled expression

#KT-37214 Fixed

idea/testData/intentions/convertLambdaToReference/labeledThis.kt

@@ -0,0 +1,13 @@
+class A {
+    fun f1() {}
+}
+
+fun myA(func: A.() -> Unit) {
+    A().func()
+}
+
+fun main() {
+    myA foo@{
+        <caret>this@foo.f1()
+    }
+}

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

@@ -0,0 +1,11 @@
+class A {
+    fun f1() {}
+}
+
+fun myA(func: A.() -> Unit) {
+    A().func()
+}
+
+fun main() {
+    myA(A::f1)
+}