Added changes for carousel of templates for creative categories

This CL aims at making changes for horizontal carousel of templates for
creative categories if there is more than one template.

Bug: b/278286891
Test: Tested by building and flashing on local
Test: Tested by going to wallpaperpicker and inside creative categories
and see that the view is now changed according to this CL. Also added a
video in the bug linked.

Change-Id: I97e3c8cddacb1afc453e488031ae0b0a48d46c71
15 files changed