Fix Talkback didn't speak "double-tap to activate" when focus on the "style...

Fix Talkback didn't speak "double-tap to activate" when focus on the "style preview" in "custom style name" page.

Reason: The card view which Talkback focused on is not clickable.
Solution: Set the click listener on this card view instead of its child view. (Like what we did in ThemeFragment and GridFragment)

Result video: https://drive.google.com/file/d/1bCDhjEIPiSc67O4r_Lu_nCcm7iberD-S/view?usp=sharing&resourcekey=0-7KHLTpmlYWvPygN7w4oyNg

Bug: 178355698
Test: Use Talkback to focus on the "style preview" in "custom style name" page. It should speak "double-tap to activate" now.
Change-Id: If4842fdfbae1bbd80b3ad05d1648d71a7a544515