Correct WindowOcclusionEnabled support range

The original CL crrev.com/c/2611675 is landed on M90 instead of M89.
Update the supported_on version range based on that.

Bug: 1163293
Change-Id: I5b641a8ab0639d3b450c9079a39735490dc64c20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642879
Commit-Queue: Owen Min <zmin@chromium.org>
Commit-Queue: Yann Dago <ydago@chromium.org>
Auto-Submit: Owen Min <zmin@chromium.org>
Reviewed-by: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845709}

components/policy/resources/policy_templates.json

@@ -1416,7 +1416,7 @@
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': [
-        'chrome.win:89-',
+        'chrome.win:90-',
       ],
       'features': {
         'can_be_recommended': False,