Print Preview: remove spellcheck in old UI

Just in case we need to revert to the old UI in M70+, also fix the issue
in the old code.

Bug: 871656
Change-Id: I2a5791888132bed32d057a5000118da11a47d1b4
Reviewed-on: https://chromium-review.googlesource.com/1177897Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584269}

chrome/browser/resources/print_preview/common/search_box.html

 <div id="search-box-template" class="search-box" hidden>
   <img src="../images/search.png" class="search-box-icon" alt="">
-  <input type="text" class="search-box-input">
+  <input type="text" class="search-box-input" spellcheck="false">
 </div>

chrome/browser/resources/print_preview/settings/advanced_settings/advanced_settings_item.html

@@ -6,7 +6,8 @@
         </select>
       </span>
       <span class="advanced-settings-item-value-text" hidden>
-        <input type="text" class="advanced-settings-item-value-text-control">
+        <input type="text" class="advanced-settings-item-value-text-control"
+            spellcheck="false">
       </span>
     </span>
 </div>

chrome/browser/resources/print_preview/settings/page_settings.html

@@ -14,7 +14,7 @@
                i18n-values="aria-label:printPagesLabel;">
         <div class="page-settings-custom-input-wrapper">
           <input class="page-settings-custom-input" type="text"
-                 id="page-settings-custom-input"
+                 id="page-settings-custom-input" spellcheck="false"
                  i18n-values="placeholder:examplePageRangeText;
                               aria-label:examplePageRangeText">
         </div>