DPWA: Move feature flag expiration for Shortcuts Menu and Run on OS Login

Updating the feature flag expiration milestone to be 88 instead of 85.
Shortcuts Menu and Run on OS Login features are still in development.

Change-Id: I0dc129278bac083708afccd1f566db353fa8ca22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265395Reviewed-by: Chris Mumford <cmumford@google.com>
Commit-Queue: Carlos Frias <carlos.frias@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#782670}

chrome/browser/flag-metadata.json

@@ -1485,7 +1485,7 @@
   {
     "name": "enable-desktop-pwas-app-icon-shortcuts-menu",
     "owners": [ "rahsin@microsoft.com", "cmumford@google.com" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 88
   },
   {
     "name": "enable-desktop-pwas-local-updating",
@@ -1495,7 +1495,7 @@
   {
     "name": "enable-desktop-pwas-run-on-os-login",
     "owners": [ "cafrias@microsoft.com", "desktop-pwas-team@google.com" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 88
   },
   {
     "name": "enable-desktop-pwas-tab-strip",