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

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

@@ -1,5 +1,7 @@
 fun foo(f: (Int) -> String) {}
 
 fun test() {
-    foo(fun(it: Int): String { return "$it" })
+    foo(fun(it: Int): String {
+        return "$it"
+    })
 }