"Convert lambda to reference": fix case with extension 'this'

#KT-21999 Fixed

idea/testData/intentions/convertLambdaToReference/memberInScopeFunction.kt

@@ -0,0 +1,14 @@
+// WITH_RUNTIME
+fun foo(f: () -> Unit) {}
+
+class Bar {
+    fun bar() {}
+}
+
+class Test {
+    fun test() {
+        with(Bar()) {
+            foo { <caret>bar() }
+        }
+    }
+}