ewmh.activate: raise a client always

When a client is not visible, this would adjust its stacking order
still.

This also addresses https://github.com/awesomeWM/awesome/issues/472,
because it raises unminimized clients after they got focused.

lib/awful/ewmh.lua

@@ -162,9 +162,8 @@ end
 function ewmh.activate(c, context, hints)
     client.focus = c
     if hints and hints.raise then
-        if awesome.startup or c:isvisible() then
+        c:raise()
-            c:raise()
+        if not awesome.startup and not c:isvisible() then
-        else
             c.urgent = true
         end
     end