Grid/filmstrip switching behavior improvements

Grid/filmstrip switching behavior improvements

Bug: 7200453
Bug: 7196483
Bug: 7222179
Bug: 7224619

Changes:
- Launch camera in capture even if paused in grid/filmstrip
- Fixed behavior of filmstrip button after launching grid
  from camera
- Refresh bar timeouts after swiping a photo
- Partially swiping from camera to filmstrip without lifting
  finger and then swiping back no longer results in unwanted
  switch to filmstrip
- Removed hacky solution to switching to filmstrip mode

Change-Id: I5cdde927e6a27a03b99a7f4883c5601bc281f4c8