[XPD] Rename to settingslib_expressive_preference_selector_with_widget

Rename layout-v36/preference_selector_with_widget to
layout-v36/settingslib_expressive_preference_selector_with_widget,
allowing us to modify the expressive-design-enabled version of this
layout separately from the previous layout.

(This probably shouldn't have been named
layout-v36/preference_selector_with_widget to begin with, because it
would override this file even when expressive design is disabled.)

Test: manual
Relnote: N/A
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Bug: 393978591
Bug: 375481245
Change-Id: I1a768d80954750757b9c29b8ccd8462b6ae1282c