Fix missing style for category preference in SUW

The usage of settingslib_expressive_preference_category in SUW only has
these themes:

* PreferenceTheme.SettingsLib.Expressive
* SudThemeGlifExpressive.DayNight
* SetupWizardPartnerResource
* SettingsPreferenceTheme.SetupWizard.Expressive
* Theme.Settings
* Theme.DeviceDefault.Light.DarkActionBar

I searched the usage of settingslib_expressive_preference_icon_frame and
it's only used by *_expressive_* layouts. Hence adding these styles to
PreferenceTheme.SettingsLib.Expressive instead of PreferenceTheme.SettingsLib

Bug: 434590559
Test: Manually using SUW
Flag: EXEMPT bugfix
Change-Id: Idfdd483197fdbc341ae923c28adae0d21ffa38f1