Revert "awful.autofocus: fix multiple screens autofocus"

This reverts commit 7575f64993.

As seen on ML:

Switching tags with multiple heads causes focus to change
screens with this commit

Signed-off-by: perry <perry.hargrave@gmail.com>
Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful/autofocus.lua.in

@@ -20,13 +20,6 @@ local function check_focus(obj)
         local c = aclient.focus.history.get(obj.screen, 0)
         if c then client.focus = c end
     end
-    -- If we didn't find a client, try other screens.
-    if not client.focus or not client.focus:isvisible() then
-        for i = 1, screen.count() do
-            local c = aclient.focus.history.get(i, 0)
-            if c and c:isvisible() then client.focus = c; return end
-        end
-    end
 end
 
 atag.attached_add_signal(nil, "property::selected", check_focus)