[Refueling Visualizer] Update background image and general style

src/shared/Modules/RefuelingVisualizer/111.png

...hared/Modules/RefuelingVisualizer/RefuelingVisualizer.cpp

src/shared/Modules/RefuelingVisualizer/RefuelingVisualizer.h

...ules/RefuelingVisualizer/RefuelingVisualizerCommandList.h

src/shared/Modules/RefuelingVisualizer/background.png

...shared/Modules/RefuelingVisualizer/valve_horiz_closed.png

...shared/Modules/RefuelingVisualizer/valve_horiz_opened.png

src/shared/Modules/RefuelingVisualizer/valve_vert_closed.png

src/shared/Modules/RefuelingVisualizer/valve_vert_opened.png