Re-write duplicated assertions

The modified assertions targeted the property descriptor for the
template object's first "cooked" value. The code immediately preceeding
these statements asserts these values.

Update the assertions to instead target the property descriptor for the
template object's first "raw" value (which are otherwise untested).

BUG=

Review URL: https://codereview.chromium.org/1049523003

Cr-Commit-Position: refs/heads/master@{#27566}

AUTHORS

@@ -76,6 +76,7 @@ Maxim Mossienko <maxim.mossienko@gmail.com>
 Michael Lutz <michi@icosahedron.de>
 Michael Smith <mike@w3.org>
 Mike Gilbert <floppymaster@gmail.com>
+Mike Pennisi <mike@mikepennisi.com>
 Nicolas Antonius Ernst Leopold Maria Kaiser <nikai@nikai.net>
 Paolo Giarrusso <p.giarrusso@gmail.com>
 Patrick Gansterer <paroga@paroga.com>

test/mjsunit/es6/templates.js

@@ -305,9 +305,9 @@ var obj = {
     assertTrue(cooked0.enumerable);
 
     var raw0 = Object.getOwnPropertyDescriptor(cs.raw, "0");
-    assertFalse(cooked0.writable);
-    assertFalse(cooked0.configurable);
-    assertTrue(cooked0.enumerable);
+    assertFalse(raw0.writable);
+    assertFalse(raw0.configurable);
+    assertTrue(raw0.enumerable);
 
     var length = Object.getOwnPropertyDescriptor(cs, "length");
     assertFalse(length.writable);