Update lockscreen shortcuts color tokens

Use the proper colors for the lockscreen shortcuts

Fixes: 287072561
Fixes: 290316219
Test: manual - toggle shortcut on and off in light mode, verify correct colors
Test: manual - toggle shortcut on and off in dark mode, verify correct colors
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:2e72e9467fd0be5819993bf23ba9decdb1f6c3df)
Merged-In: I17a5444d6c21b9a109b6c9a308d367a4503f5fdc
Change-Id: I17a5444d6c21b9a109b6c9a308d367a4503f5fdc