ParanoidOTA: Show selected GApps type as summary

https://paranoidandroid.atlassian.net/browse/AOSPA-438

The OTA Settings screen should show the selected GApps type (for
example, "Full package") instead of the un-informative "Choose package"
message that was previously shown

Change-Id: Ic43b71c9b6a0389a60ca2b3ff7c4b778a37c19ba