android: cleanup LOKitShell

Change-Id: I3ccc306f6ad54d7dcac1adf5657dea4171a4cfa0
android: use linear scaler for better quality tiles

Change-Id: I60874ad0c849d3f4bc9ff05a7c96daa0bfd3946d
android: refresh screenshot correctly, fix rendering at load

Change-Id: I38345399c96764ecc454cc3e6e8f87b5cc5e8fbe