Fallback Home doesn't restart on keyboard change

Fallback Home gets launched multiple times due to
CONFIG_KEYBOARD_HIDDEN, which is irrelevant for it. So we mark the
activity to not be restarted on this config change.

Test: manual
Bug: 215439232
Change-Id: I558091979840a6b664e39f6b8bd22957d1b2b729
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0279eec..5877b13 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -2885,7 +2885,8 @@
                   android:screenOrientation="nosensor"
                   android:taskAffinity="com.android.settings.FallbackHome"
                   android:exported="true"
-                  android:theme="@style/FallbackHome">
+                  android:theme="@style/FallbackHome"
+                  android:configChanges="keyboardHidden">
             <intent-filter android:priority="-1000">
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.HOME" />