Fix formatting in some of test data files.

Adapted from https://github.com/develar/kotlin/commit/a9e0a42fb1347fa8e21c86b5a073ef8a7c873da0.

js/js.translator/testFiles/expression/function/cases/adderClosure.kt

@@ -1,9 +1,9 @@
 package foo
 
-fun box() : Boolean {
-  var sum = 0
-  val adder = {(a: Int) -> sum += a }
-  adder(3)
-  adder(2)
-  return sum == 5
+fun box(): Boolean {
+    var sum = 0
+    val adder = {(a: Int) -> sum += a}
+    adder(3)
+    adder(2)
+    return sum == 5
 }