fix: droiddeckctl reaches builds shipped under a variant package
The provider authority and the start Activity's component were fixed to
com.droiddeck.launcher, so droiddeckctl could not talk to the antutu,
ludashi or pubg builds from tools/release/variants.txt. DROIDDECK_PACKAGE
now picks the package; the Activity's class name stays the same in every
variant.
Co-authored-by: angelrenefm <17342133+angelrenefm@users.noreply.github.com>