Add background to pixel value label in 2D view. Revert color scheme
Add background to pixel value label in 2D view. Revert color scheme

Change-Id: I7655b31e783c4a40fb995718936f0f4948b1a104

IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense