[IntentHandling] Extend the intent-picker-pwa-persistence flag to M92.

This CL extends the intent-picker-pwa-persistence flag to M92 given it
is not lanched yet.

BUG=853604

Change-Id: If996223ce26e2865d4b33528af2bc02fa6492c2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594828Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837479}

chrome/browser/flag-metadata.json

@@ -3077,7 +3077,7 @@
   {
     "name": "intent-picker-pwa-persistence",
     "owners": [ "chromeos-apps-foundation-team@google.com" ],
-    "expiry_milestone": 88
+    "expiry_milestone": 92
   },
   {
     "name": "interest-feed-notice-card-auto-dismiss",