Replace deprecated lambda syntax in testData

It's done with similar constructions where possible trying to preserve
intended behavior.
Some usages are removed because they test exactly the feature that
we are going to drop soon.

js/js.translator/testData/examples/cases/closureWithParameter.kt

@@ -1,5 +1,5 @@
 fun box(): String {
-    return apply("OK", {(arg: String) -> arg })
+    return apply("OK", { arg: String -> arg })
 }
 
 fun apply(arg: String, f: (p: String) -> String): String {

js/js.translator/testData/examples/cases/closureWithParameterAndBoxing.kt

@@ -1,5 +1,5 @@
 fun box(): String {
-    return if (apply(5) {(arg: Int) -> arg + 13 } == 18) "OK" else "fail"
+    return if (apply(5) { arg: Int -> arg + 13 } == 18) "OK" else "fail"
 }
 
 fun apply(arg: Int, f: (p: Int) -> Int): Int {

js/js.translator/testData/examples/cases/extensionClosure.kt

@@ -1,7 +1,7 @@
 class Point(val x: Int, val y: Int)
 
 fun box(): String {
-    val answer = apply(Point(3, 5), { Point.(scalar: Int): Point ->
+    val answer = apply(Point(3, 5), { scalar: Int ->
         Point(x * scalar, y * scalar)
     })