Add support for deepin polkit agent
From demonicpancake in (github)[https://github.com/leapcode/bitmask_client/issues/1026]:
# ps aux | grep polkit
polkitd 461 0.0 0.2 522852 17076 ? Ssl Jul10 0:00 /usr/lib/polkit-1/polkitd --no-debug
demonic+ 752 0.0 0.3 646364 28592 ? Sl Jul10 0:03 /usr/lib/polkit-1-dde/dde-polkit-agent