Add WRITE_CONTACTS to PermissionLockdownTestActivity

Ensure that the Permission lockdown tests set both READ_CONTACTS and
WRITE_CONTACTS when setting device admin policy.

Change-Id: I36767be3f475716def7d323908038d74acebd081
Merged-In: I776ca2ecd281c2b4ec2317f168e3c061257d2129
Test: Existing CtsVerifier Tests
Bug: 171755760
1 file changed