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

idea/testData/intentions/lambdaToAnonymousFunction/extention2.kt.after

@@ -2,5 +2,7 @@ class Foo
 fun baz(f: Foo.(i: Int, j: Int) -> Int) {}
 
 fun main(args: Array<String>) {
-    baz(fun Foo.(i: Int, j: Int): Int { return i + j })
+    baz(fun Foo.(i: Int, j: Int): Int {
+        return i + j
+    })
 }