Fix naming of default_icon_color_accent1_container_tint_list

This color was meant to be called
default_icon_color_on_accent1_container_tint_list, emphasis on the "on."

This CL also changes the color used from a text color to just the attr
because this is an icon color.

Change-Id: Ie4449bd83cbc85f6d90bceb2ecf29d7d99c0d8bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5407873


Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/main@{#1280288}