qapitrace: arrow-key selected Call is obstructed

If the Frame at the bottom of the current view is expanded and
the down arrow-key is used to select the first Call in the Frame
then the Details View window that pops up obstructs the Call.

NOTE: If the first Call is instead selected with a mouse-click
      then the Call appropriately scrolls into view

Not a big deal but disconcerting.

DIRECTIONS
1) Select and expand the Frame at the bottom of the current view
2) Use the down arrow-key to move to the first Call in the Frame

FIX
In selection callback for Call (MainWindow::callItemSelected) add
    m_ui.callView->scrollTo(index)
after the Details View window is shown

TESTING
Manual testing.

Signed-off-by: Lawrence L Love <lawrencex.l.love@intel.com>