Revert "Reduce memory usage of default thumbnail"

This reverts commit 9926272f32868c858b24b45e048210cf3515741e.

Conflicts:
	packages/SystemUI/src/com/android/systemui/recent/Recents.java
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java

	deleted:    packages/SystemUI/src/com/android/systemui/recent/ColorDrawableWithDimensions.java
	modified:   packages/SystemUI/src/com/android/systemui/recent/RecentTasksLoader.java
	modified:   packages/SystemUI/src/com/android/systemui/recent/Recents.java
	modified:   packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java
	modified:   packages/SystemUI/src/com/android/systemui/recent/TaskDescription.java
Fix revert
	modified:   packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java