Revert "fixup! Don't discard custom grid on config changes"

Reason for revert: Not needed after QPR3

This reverts commit cd8fe752335da42592d621b5a61d5cc0cf44c57b.

Change-Id: I93fb1a40a302a5d9ba75cf2be3a6229fbaaa775c
diff --git a/src/com/android/launcher3/InvariantDeviceProfile.java b/src/com/android/launcher3/InvariantDeviceProfile.java
index 9caf7f2..3100f72 100644
--- a/src/com/android/launcher3/InvariantDeviceProfile.java
+++ b/src/com/android/launcher3/InvariantDeviceProfile.java
@@ -497,7 +497,7 @@
 
         // Re-init grid
         String gridName = getCurrentGridName(context);
-        initGrid(context, LauncherPrefs.getPrefs(context).getString(KEY_IDP_GRID_NAME, gridName));
+        initGrid(context, Utilities.getPrefs(context).getString(KEY_IDP_GRID_NAME, gridName));
 
         boolean modelPropsChanged = !Arrays.equals(oldState, toModelState());
         for (OnIDPChangeListener listener : mChangeListeners) {