Hob: fixed the tabbar search entry retaining focus when user has clicked off it issue

Add reset focus code to fixed the search entry retaining focus issue

(From Poky rev: 75969f92af4b0aae25dcaa3321f835dd729f4bf9)

(Bitbake rev: 0531730b255f41b2804bcd322e10c52cbf13537a)

Signed-off-by: Liming An <limingx.l.an@intel.com>
Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/crumbs/hobwidget.py

@@ -344,6 +344,7 @@ class HobTabBar(gtk.DrawingArea):
                    and (child["y"] < y) and (y < child["y"] + self.tab_height):
                    self.current_child = child
                    result = True
+                   self.grab_focus()
                    break
 
             # check the blank area is focus in or not