widget/material: add missing Update calls

Without the updates, the switch and radiobutton would use stale state
for layout.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

widget/material/radiobutton.go

@@ -38,6 +38,7 @@ func RadioButton(th *Theme, group *widget.Enum, key, label string) RadioButtonSt
 
 // Layout updates enum and displays the radio button.
 func (r RadioButtonStyle) Layout(gtx layout.Context) layout.Dimensions {
+	r.Group.Update(gtx)
 	hovered, hovering := r.Group.Hovered()
 	focus, focused := r.Group.Focused()
 	return r.Group.Layout(gtx, r.Key, func(gtx layout.Context) layout.Dimensions {

widget/material/switch.go

@@ -39,6 +39,7 @@ func Switch(th *Theme, swtch *widget.Bool, description string) SwitchStyle {
 
 // Layout updates the switch and displays it.
 func (s SwitchStyle) Layout(gtx layout.Context) layout.Dimensions {
+	s.Switch.Update(gtx)
 	trackWidth := gtx.Dp(36)
 	trackHeight := gtx.Dp(16)
 	thumbSize := gtx.Dp(20)