Fixed disabling for "Set As separated object" context menu item
Fixed disabling for "Set As separated object" context menu item

+ added missed bug fix in get_freq_settings_choice (part of b9899f9496029354b3c96a5088f56e2f03a1338d)

prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r