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/expression/function/cases/expressionAsExtFunction.kt

@@ -1,7 +1,7 @@
 package foo
 
 fun box(): String {
-    val a = 23.{ Int.(a: Int) -> a * a + this }(3)
+    val a = 23.(fun Int.(a: Int): Int = a * a + this)(3)
     if (a != 32) return "a != 32, a = $a";
 
     return "OK";