Don't allow starting DeveloperOptionsFragment on non-debug builds am: a343699760 am: 85435ff751

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15787659

Change-Id: Ic958cdc3ce8c7e478d6f4eefeec5bb1f87c9ede2