Don't allow starting DeveloperOptionsFragment on non-debug builds am: a343699760 am: 9ac2800849

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

Change-Id: I1aca16c6331bd6d488f1f0ed88dc8e9b2401d8f0