[DPWA] Extend bypass-app-banner-engagement-checks, actively used.

This flag is used by developers for automated webapp testing. Extending
the life, and re-assigning myself as owner.

Bug: 1159277
Change-Id: Ib10f09aa4deaa1bdb3de8a3ced87053dab37e6cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612487Reviewed-by: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840620}

chrome/browser/flag-metadata.json

@@ -444,8 +444,8 @@
   },
   {
     "name": "bypass-app-banner-engagement-checks",
-    "owners": [ "dominickn" ],
-    "expiry_milestone": 88
+    "owners": [ "dmurph" ],
+    "expiry_milestone": 95
   },
   {
     "name": "calculate-native-win-occlusion",