Dismiss dialog onPause when lifecycleOwner is set (#1845)

lifecycle/src/main/java/com/afollestad/materialdialogs/lifecycle/DialogLifecycleObserver.kt

@@ -25,4 +25,6 @@ import androidx.lifecycle.OnLifecycleEvent
 internal class DialogLifecycleObserver(private val dismiss: () -> Unit) : LifecycleObserver {
   @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
   fun onDestroy() = dismiss()
+  @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
+  fun onPause() = dismiss()
 }