[CrOS settings] Fix printing new route in settings page

https://chromium-review.googlesource.com/c/chromium/src/+/2126332
Changes the routes to printing pages in settings. os_printing_page has a
route that was missed. This CL updates the route in
os_printing_page.html to match the new route, from /printing to
osPrinting.

Fix: 1068322
Change-Id: I2e9095ff805d2f94bf4c520717d3290fab912807
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138632Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: jimmy gong <jimmyxgong@chromium.org>
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Cr-Commit-Position: refs/heads/master@{#756949}

chrome/browser/resources/settings/chromeos/os_printing_page/os_printing_page.html

@@ -11,7 +11,7 @@
 <dom-module id="os-settings-printing-page">
   <template>
     <style include="settings-shared"></style>
-    <settings-animated-pages id="pages" section="printing"
+    <settings-animated-pages id="pages" section="osPrinting"
         focus-config="[[focusConfig_]]">
       <div route-path="default">
         <cr-link-row id="cupsPrinters" label="$i18n{cupsPrintersTitle}"