Removed active and _heading properties
Removed active and _heading properties

They were causing variable scoping conflicts. This in turn caused the
widget to not update. Active property is not needed since the handling
of active/inactive vehicle is handled outside of the control

dagoodma/qgroundcontrol,dagoodma/qgroundcontrol,catch-twenty-two/qgroundcontrol,remspoor/qgroundcontrol,kd0aij/qgroundcontrol,Hunter522/qgroundcontrol,ethz-asl/qgc_asl,cfelipesouza/qgroundcontrol,scott-eddy/qgroundcontrol,CornerOfSkyline/qgroundcontrol,catch-twenty-two/qgroundcontrol,CornerOfSkyline/qgroundcontrol,kd0aij/qgroundcontrol,scott-eddy/qgroundcontrol,remspoor/qgroundcontrol,mihadyuk/qgroundcontrol,RedoXyde/PX4_qGCS,kd0aij/qgroundcontrol,dagoodma/qgroundcontrol,RedoXyde/PX4_qGCS,CornerOfSkyline/qgroundcontrol,RedoXyde/PX4_qGCS,kd0aij/qgroundcontrol,cfelipesouza/qgroundcontrol,scott-eddy/qgroundcontrol,ethz-asl/qgc_asl,dagoodma/qgroundcontrol,kd0aij/qgroundcontrol,RedoXyde/PX4_qGCS,catch-twenty-two/qgroundcontrol,CornerOfSkyline/qgroundcontrol,CornerOfSkyline/qgroundcontrol,ethz-asl/qgc_asl,remspoor/qgroundcontrol,catch-twenty-two/qgroundcontrol,ethz-asl/qgc_asl,Hunter522/qgroundcontrol,mihadyuk/qgroundcontrol,mihadyuk/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,RedoXyde/PX4_qGCS,remspoor/qgroundcontrol,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,cfelipesouza/qgroundcontrol,remspoor/qgroundcontrol,dagoodma/qgroundcontrol,dagoodma/qgroundcontrol,cfelipesouza/qgroundcontrol,mihadyuk/qgroundcontrol,CornerOfSkyline/qgroundcontrol,Hunter522/qgroundcontrol,scott-eddy/qgroundcontrol,mihadyuk/qgroundcontrol,scott-eddy/qgroundcontrol,Hunter522/qgroundcontrol,mihadyuk/qgroundcontrol,remspoor/qgroundcontrol,cfelipesouza/qgroundcontrol,RedoXyde/PX4_qGCS,cfelipesouza/qgroundcontrol,catch-twenty-two/qgroundcontrol,ethz-asl/qgc_asl,scott-eddy/qgroundcontrol