Properly handle dialog dismiss for SafetyNet

Fix #3103

app/src/main/java/com/topjohnwu/magisk/ui/safetynet/CheckSafetyNetEvent.kt

@@ -123,6 +123,9 @@ class CheckSafetyNetEvent(
                 titleRes = android.R.string.cancel
                 onClick { callback(SafetyNetResult(dismiss = true)) }
             }
+            .onDismiss {
+                callback(SafetyNetResult(dismiss = true))
+            }
             .reveal()
     }