JS: move expressions test to box tests

js/js.translator/testData/box/expression/if/ifElseAsExpressionWithThrow.kt

@@ -0,0 +1,11 @@
+package foo
+
+fun box(): String {
+    try {
+        if (true) throw Exception() else "fail1"
+    }
+    catch (e: Exception) {
+        return "OK"
+    }
+    return "fail2"
+}