Regression fix: Settings string migration to new ICU format

* Fixes a syntax error introduced in https://crrev.com/c/2106171 that
  blocks translation message extraction.

Change-Id: I4f9b1999d60a41c03846f01a0ae0db29c2bba701
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107547
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Auto-Submit: Rainhard Findling <rainhard@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751266}

chrome/app/settings_strings.grdp

@@ -2371,7 +2371,7 @@
     Show all (recommended)
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_COOKIES_ALLOW" desc="The sub-label for links to manage cookies when the current cookie setting is allow.">
-    {COUNT plural,
+    {COUNT, plural,
      =0 {Cookies are allowed}
      =1 {Cookies are allowed, 1 exception}
      other {Cookies are allowed, {COUNT} exceptions}}