Revert "Set c.screen in ewmh.tag and before tags in rules.execute"

This reverts commit 3f9c439311.

lib/awful/ewmh.lua.in

@@ -147,7 +147,6 @@ function ewmh.tag(c, t)
     if not t then
         c.sticky = true
     else
-        c.screen = awful.tag.getscreen(t)
         c:tags({ t })
     end
 end

lib/awful/rules.lua.in

@@ -206,8 +206,8 @@ function rules.execute(c, props, callbacks)
         if property == "floating" then
             aclient.floating.set(c, value)
         elseif property == "tag" then
-            c.screen = atag.getscreen(value)
             c:tags({ value })
+            c.screen = atag.getscreen(value)
         elseif property == "switchtotag" and value and props.tag then
             atag.viewonly(props.tag)
         elseif property == "height" or property == "width" or