Fixes missing Select to Speak settings page.

The manifest was not updated to the proper location of
the select to speak options page. This fixes the page by
adjusting the manifest.

Bug: 1062198
Change-Id: I5f40fe51ffa09f49e23b0500ad0954d039b07d22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106962
Commit-Queue: Katie Dektar <katie@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Auto-Submit: Katie Dektar <katie@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750983}

chrome/browser/resources/chromeos/accessibility/select_to_speak_manifest.json.jinja2

@@ -45,7 +45,7 @@
     "desktop": true
   },
   "default_locale": "en",
-  "options_page": "options.html",
+  "options_page": "select_to_speak/options.html",
   "content_scripts": [
     {
       "matches": [ "https://docs.google.com/document*",