Disables local color extraction for widgets

As discovered during investigation of system health issues, doing local
color extraction in widgets (for the purpose of making their color
matches the background during a drag) took many CPU cycle during layout
pass, which may have contributed to animation janks in various scenario.
This CL removes the feature in favors of better performance.

Bug: 266941872
Test: manually verified theme are still honored in widgets.
Change-Id: I63b13bc005907779af2322cd4bedbe141b0f3e27