Migrate testdata to new lambda syntax

idea/testData/intentions/operatorToFunction/notApplicableFunctionCallWithCallableReference.kt

@@ -1,6 +1,6 @@
 // WITH_RUNTIME
 // IS_APPLICABLE: false
 fun foo() {
-    val bar = { (x: Int) -> x + 1 }
+    val bar = { x: Int -> x + 1 }
     val incremented = listOf(1, 2, 3).<caret>map(bar)
 }