Revert "[CrOS settings] Fix printing new route in settings page"

This reverts commit 4c027362.

Reason for revert: Potentially breaking https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/4672

Original change's description:
> [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/+/2138632
> Reviewed-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}

TBR=khorimoto@chromium.org,jimmyxgong@chromium.org,hsuregan@chromium.org,tjohnsonkanu@google.com

Change-Id: I50d29f93d85233a198f62baec0e65b4c5eda9b4f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139172Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756973}

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="osPrinting"
+    <settings-animated-pages id="pages" section="printing"
         focus-config="[[focusConfig_]]">
       <div route-path="default">
         <cr-link-row id="cupsPrinters" label="$i18n{cupsPrintersTitle}"