Lambda to anonymous function: use callable builder (KT-7710)

idea/testData/intentions/lambdaToAnonymousFunction/extention1.kt.after

@@ -2,5 +2,7 @@ class Foo
 fun bar(f: Foo.() -> Unit) {}
 
 fun main(args: Array<String>) {
-    bar(fun Foo.() {})
+    bar(fun Foo.() {
+
+    })
 }