Naughty: Fix the text margin

No idea where this comes from or why it worked before, but it's obviously wrong.

Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Danjou <julien@danjou.info>

lib/naughty.lua.in

@@ -313,7 +313,7 @@ function notify(args)
     -- create textbox
     local textbox = capi.widget({ type = "textbox", align = "flex" })
     textbox.buttons = util.table.join(button({ }, 1, run), button({ }, 3, die))
-    textbox:margin({ right = margin, left = margin, bottom = 2 * margin })
+    textbox:margin({ right = margin, left = margin, bottom = margin, top = margin })
     textbox.text = string.format('<span font_desc="%s"><b>%s</b>%s</span>', font, title, text)
     if hover_timeout then textbox.mouse_enter = hover_destroy end