PR #7758 from Nir: fix viewer combo box issue
PR #7758 from Nir: fix viewer combo box issue

(cherry picked from commit a5e823dfcddd58a4e4862e91662ef67ec4a1cbad)

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