[Catalog] buttons are not expressive

[manabu-nakamura]

Description: The buttons are not expressive.

Expected behavior: The buttons are expressive.

Source code: https://github.com/material-components/material-components-android/blob/master/catalog/java/io/material/catalog/button/res/layout/cat_label_icon_buttons_content.xml

Android API version: 35

Material Library version: c806284

Device: Android Emulator 35.4.9