ColorPicker: declare box-sizing for panel (#9780)
ColorPicker: declare box-sizing for panel (#9780)

in case some users declare `box-sizing: border-box` globally and may causing unexpected problems
ElemeFE/element,ElemeFE/element,Kingwl/element,Raganof/element,Kingwl/element,Raganof/element,baiyaaaaa/element,huguangju/element,baiyaaaaa/element,huguangju/element