[PC3 ProgressBar] Set binding for width
Otherwise the progress bar will never update its size when it was indeterminate at one point..
Regression from https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/140
Otherwise the progress bar will never update its size when it was indeterminate at one point..
Regression from https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/140