Tweak spring-loaded workspace.

- No page indicators in spring-loaded mode
- Don’t move workspace up as high
- Scale workspace at 90% instead of 80% on phones
- Increase speed of workspace -> spring-loaded -> workspace
- Widgets were being scaled down twice when dragging from widget picker
- Don't scale up icons when dragging (scaling other stuff down is enough)
- Make scrim less dark and panels more transparent
- Thin white border around page instead of highlight when hovering

Change-Id: I963e91c20d4c0340480d165e0f3b8064783c0cb2