Group name edit input fixes

* Make the input open more consistently when
  editing group names
* Close the keyboard when group name edit dialog
  is dismissed via cancel button
* Allow spell check when editing the group name.
  Also, set the same input type on the editor
  group name dialog.

Bug 29536575
Bug 29537527

Change-Id: Icc12a5168dc7429274edd42c3f7da20e1c1a723a