Retrieve the focus on Gboard after power off/on

After power off/on, RCU key doesn't work on Gboard
when setting IP address. So retrieve the focus on
Gboard.

Bug: 193378016
Change-Id: Ic160f01d417878ad7477e6e9c91492f9f28bd043
diff --git a/Settings/src/com/android/tv/settings/connectivity/setup/IpAddressState.java b/Settings/src/com/android/tv/settings/connectivity/setup/IpAddressState.java
index 91ff7a2..e8714ec 100644
--- a/Settings/src/com/android/tv/settings/connectivity/setup/IpAddressState.java
+++ b/Settings/src/com/android/tv/settings/connectivity/setup/IpAddressState.java
@@ -131,6 +131,12 @@
         }
 
         @Override
+        public void onResume() {
+            super.onResume();
+            openInEditMode(mAction);
+        }
+
+        @Override
         public long onGuidedActionEditedAndProceed(GuidedAction action) {
             if (action.getId() == GuidedAction.ACTION_ID_CONTINUE) {
                 mAdvancedOptionsFlowInfo.put(AdvancedOptionsFlowInfo.IP_ADDRESS,