Sharesheet - Fix 4->8 direct share expansion glitch

Fix the drag handle and spacing. Set the initial sharesheet size
properly to allow for 2 rows + space to expand the direct share area.

Bug: 128969671
Test: atest ChooserActivityTest and visual inspection
Change-Id: I24f2ffd027c2edd69d90ab31c287ec773b7a7039
7 files changed