Fix #62169466 bug report sharing options empty

Was caused by a new requirement to not offer to show
non-exported intent handlers as options. For first
time warning dialog, don't show a chooser activity.

Change-Id: Ibada9a7a14b77ec0670bf35ba0944f369d42bf69
Fixes: 62169466
Test: manual
Test: mmm -j32 frameworks/base/packages/Shell && adb install -r -g ${OUT}/data/app/ShellTests/ShellTests.apk && adb shell am instrument -e class com.android.shell.BugreportReceiverTest$1 -w com.android.shell.tests/android.support.test.runner.AndroidJUnitRunner