Updates to manage button based on latest mocks

- manage button should be inset from the expanded view edge
  but the menu should be flush with expanded view edge.
- button size is smaller (36dp instead of 40dp)
- more padding (16dp above / below on both tablet & phone)
- diff colour N1-800 instead of N1-900

Test: visual 1 - expand a bubble and look at 'manage' button
             2 - tap on the button and look at the menu
             3 - do 1 & 2 on tablet & in RTL & on phone
                 landscape
Bug: 183658858
Change-Id: I4b5ffc26602b72ee28d26476fc222df3e2e1e80b