Revert "Frameworks: SlimRecents - add TRDS"

This reverts commit e35a802687be1b3b2939e8b9c337c0bb87ef14dd.

Conflicts:
	packages/SystemUI/res/drawable-holodark-hdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-mdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-xhdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-xxhdpi/recent_bg_dropshadow.9.png