JS backend: move patternMatching tests to expression/when

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

@@ -0,0 +1,22 @@
+package foo
+
+
+fun box(): Boolean {
+    var result = false
+    val i = 1
+    when (i) {
+        1 ->
+            when (i) {
+                1 ->    result = true
+                else -> result = false
+            }
+
+        else ->
+            when (i) {
+                1 ->    result = true
+                else -> result = false
+            }
+    }
+
+    return result;
+}