Fix crash on mouse click in change view

The name of the initial focus method in the hypertext widget
changed from focusItemLeft to focusFirstItem.  This would cause
a crash if the mouse was clicked in the change screen when an
item in the hypertext widget was not already focused.

Change-Id: I046115f43bdd41640ebdaf45198ff3ae4770bb97

gertty/mywid.py

@@ -213,7 +213,7 @@ class HyperText(urwid.Text):
         item = self.getItemAtCoords(size[0], col, row)
         if item is None:
             if self.focused_index is None:
-                self.focusItemLeft()
+                self.focusFirstItem()
             return False
         if event == 'mouse press':
             self.focusItem(item)