Add more logs to investigate empty launcher restore

Flag: EXEMPT logs
Test: presubmit
Bug: 377510898
Change-Id: I1c05b90c9e1337663c4c06703ad14b6c0d00aa07
diff --git a/src/com/android/launcher3/LauncherPrefs.kt b/src/com/android/launcher3/LauncherPrefs.kt
index 712c56c..5b9c2fa 100644
--- a/src/com/android/launcher3/LauncherPrefs.kt
+++ b/src/com/android/launcher3/LauncherPrefs.kt
@@ -20,6 +20,7 @@
 import android.content.SharedPreferences
 import androidx.annotation.VisibleForTesting
 import com.android.launcher3.BuildConfig.WIDGET_ON_FIRST_SCREEN
+import com.android.launcher3.InvariantDeviceProfile.GRID_NAME_PREFS_KEY
 import com.android.launcher3.LauncherFiles.DEVICE_PREFERENCES_KEY
 import com.android.launcher3.LauncherFiles.SHARED_PREFERENCES_KEY
 import com.android.launcher3.model.DeviceGridState
@@ -138,7 +139,7 @@
         @JvmField
         val GRID_NAME =
             ConstantItem(
-                "idp_grid_name",
+                GRID_NAME_PREFS_KEY,
                 isBackedUp = true,
                 defaultValue = null,
                 encryptionType = EncryptionType.ENCRYPTED,