removing static type assertions work in progress

js/js.translator/testData/expression/when/cases/matchNullableType.kt

@@ -5,7 +5,7 @@ class A() {
 }
 
 fun box(): Boolean {
-    var a = null : A?
+    var a: A? = null
     when(a) {
         is A? -> return true
         else -> return false

js/js.translator/testData/expression/when/cases/whenValueOrType.kt

@@ -10,8 +10,8 @@ class B() {
 
 fun box(): Boolean {
     var c: Int = 0
-    var a = A() : Any?
-    var b = null : Any?
+    var a: Any? = A()
+    var b: Any? = null
     when(a) {
         null -> c = 10;
         is B -> c = 10000