Print Preview Componentization: remove commented out line in test

Was accidentally introduced in https://crrev.com/c/1055657.

Bug: 773928
Change-Id: I1167284e1d03cd89154310041c1d1f64021f7725
Reviewed-on: https://chromium-review.googlesource.com/1062503Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559297}

chrome/test/data/webui/print_preview/settings_section_test.js

@@ -389,7 +389,6 @@ cr.define('settings_sections_tests', function() {
       let capabilities =
           print_preview_test_utils.getCddTemplate('FooPrinter').capabilities;
       page.set('destination_.capabilities', capabilities);
-      // assertTrue(optionsElement.hidden);
 
       // Expanding more settings will show the section.
       toggleMoreSettings();