Set the default dial background width to match the material design size
Created by: bhdouglass
For reference: https://github.com/qt/qtquickcontrols2/blob/5.9/src/imports/controls/material/Dial.qml#L51
Created by: bhdouglass
For reference: https://github.com/qt/qtquickcontrols2/blob/5.9/src/imports/controls/material/Dial.qml#L51