This increases the size of the default user icon to the size specified
by the system (190dp), using the new method added in ag/16847427.
Bug: 218838295
Test: visual inspection
Test: make RunSettingsRoboTests -j40 ROBOTEST_FILTER="com.android.settings.users.UserSettingsTest"
Change-Id: I3d88fbd1e148f0f63c796a272cd5771f4447812d