don't allow unselection of radio buttons

ui/dialogs/addeditserverdialog.go

@@ -55,6 +55,7 @@ func NewAddEditServerDialog(title string, cancelable bool, prefillServer *backen
 			legacyAuthCheck.Hide()
 		}
 	})
+	serverTypeChoice.Required = true
 	serverTypeChoice.Horizontal = true
 	selected := backend.ServerTypeSubsonic
 	if a.ServerType == backend.ServerTypeJellyfin {

ui/dialogs/settingsdialog.go

@@ -437,6 +437,7 @@ func (s *SettingsDialog) createExperimentalTab(window fyne.Window) *container.Ta
 		s.config.Application.UIScaleSize = choice
 		s.setRestartRequired()
 	})
+	uiScaleRadio.Required = true
 	uiScaleRadio.Horizontal = true
 	if s.config.Application.UIScaleSize == "Smaller" || s.config.Application.UIScaleSize == "Larger" {
 		uiScaleRadio.Selected = s.config.Application.UIScaleSize