+ Tube, Knob: fix knob dead zone logic, update requested sizes for tube widget
+ Tube, Knob: fix knob dead zone logic, update requested sizes for tube widget

jnetterf/calf,zamaudio/calf-LR4,adiknoth/calf,jnetterf/calf,jnetterf/calf,jnetterf/calf,adiknoth/calf,adiknoth/calf,zamaudio/calf-LR4,jnetterf/calf,zamaudio/calf-LR4,adiknoth/calf,zamaudio/calf-LR4,zamaudio/calf-LR4,adiknoth/calf