Fix VerificationActivity Intent

VerificationActivity crashes when the Intent sent to it doesn't have an
extras Bundle. This is because VerificationActivity copies the incoming
Intents extras Bundle with getExtras() / putExtras(Bundle), and
putExtras(Bundle) doesn't expect a null Bundle.

Bug: 145891687
Test: adb shell am start-activity \
  -n com.android.dynsystem/com.android.dynsystem.VerificationActivity \
  -a android.os.image.action.START_INSTALL \
  -d file:///storage/emulated/0/Download/aosp_arm64-dsu_test.zip

Test: Dynamic system service mustn't crash
Change-Id: I111641f366d50d739b922bcc3a52993c44212759