Use RECEIVER_EXPORTED in BugreportManagerTest

package com.android.os.bugreports.tests;

import static android.content.Context.RECEIVER_EXPORTED;

import static com.google.common.truth.Truth.assertThat;

import static org.junit.Assert.assertNotNull;

        // shell UID rather than our own.

        BugreportBroadcastReceiver br = new BugreportBroadcastReceiver();

        InstrumentationRegistry.getContext()

                .registerReceiver(br, new IntentFilter(INTENT_BUGREPORT_FINISHED));

                .registerReceiver(

                        br,

                        new IntentFilter(INTENT_BUGREPORT_FINISHED),

                        RECEIVER_EXPORTED);

        UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())

                .executeShellCommand("am bug-report");