Add mSourceDrawableId to copy constructor

The copy constructor of AdaptiveIconDrawable#LayerState currently does
not copy mSourceDrawableId from the original layer state. This prevents
drawables created from preloaded AdaptiveIconDrawables from having the
correct source drawable resource id.

Bug: 148488431
Test: CtsContentTestCases:android.content.pm.cts.PackageManagerTest
Change-Id: I7795a337a2a364677e375776c7aec5bc9189e0da