Extend lifetime of FST flag.

Delaying expiry of enable-cros-ime-input-logic-fst to M85, to match
enable-cros-ime-native-decoder.

Change-Id: I6dc14a97b702b959924a178b35bd3d197aaab252
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914585
Auto-Submit: Darren Shen <shend@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715156}

chrome/browser/flag-metadata.json

@@ -1175,7 +1175,7 @@
   {
     "name": "enable-cros-ime-input-logic-fst",
     "owners": [ "essential-inputs-team@google.com" ],
-    "expiry_milestone": 80
+    "expiry_milestone": 85
   },
   {
     "name": "enable-cros-ime-native-decoder",